diff --git a/clang/include/clang/ExtractAPI/DeclarationFragments.h b/clang/include/clang/ExtractAPI/DeclarationFragments.h
--- a/clang/include/clang/ExtractAPI/DeclarationFragments.h
+++ b/clang/include/clang/ExtractAPI/DeclarationFragments.h
@@ -170,6 +170,11 @@
     return *this;
   }
 
+  DeclarationFragments &replace(std::string NewSpelling, unsigned Position) {
+    Fragments.at(Position).Spelling = NewSpelling;
+    return *this;
+  }
+
   /// Append a text Fragment of a space character.
   ///
   /// \returns a reference to the DeclarationFragments object itself after
diff --git a/clang/lib/ExtractAPI/DeclarationFragments.cpp b/clang/lib/ExtractAPI/DeclarationFragments.cpp
--- a/clang/lib/ExtractAPI/DeclarationFragments.cpp
+++ b/clang/lib/ExtractAPI/DeclarationFragments.cpp
@@ -397,6 +397,9 @@
   DeclarationFragments QualsFragments = getFragmentsForQualifiers(SQT.Quals),
                        TypeFragments =
                            getFragmentsForType(SQT.Ty, Context, After);
+  if (QT.getAsString() == "_Bool")
+    TypeFragments.replace("bool", 0);
+
   if (QualsFragments.getFragments().empty())
     return TypeFragments;
 
diff --git a/clang/test/ExtractAPI/bool.c b/clang/test/ExtractAPI/bool.c
new file mode 100644
--- /dev/null
+++ b/clang/test/ExtractAPI/bool.c
@@ -0,0 +1,204 @@
+// RUN: rm -rf %t
+// RUN: split-file %s %t
+// RUN: sed -e "s@INPUT_DIR@%{/t:regex_replacement}@g" \
+// RUN: %t/reference.output.json.in >> %t/reference.output.json
+// RUN: %clang -extract-api -target arm64-apple-macosx \
+// RUN: %t/input.h -o %t/output.json
+
+// Generator version is not consistent across test runs, normalize it.
+// RUN: sed -e "s@\"generator\": \".*\"@\"generator\": \"?\"@g" \
+// RUN: %t/output.json >> %t/output-normalized.json
+// RUN: diff %t/reference.output.json %t/output-normalized.json
+
+//--- input.h
+#include <stdbool.h>
+bool Foo;
+
+bool IsFoo(bool Bar);
+/// expected-no-diagnostics
+
+//--- reference.output.json.in
+{
+  "metadata": {
+    "formatVersion": {
+      "major": 0,
+      "minor": 5,
+      "patch": 3
+    },
+    "generator": "?"
+  },
+  "module": {
+    "name": "",
+    "platform": {
+      "architecture": "arm64",
+      "operatingSystem": {
+        "minimumVersion": {
+          "major": 11,
+          "minor": 0,
+          "patch": 0
+        },
+        "name": "macosx"
+      },
+      "vendor": "apple"
+    }
+  },
+  "relationships": [],
+  "symbols": [
+    {
+      "accessLevel": "public",
+      "declarationFragments": [
+        {
+          "kind": "typeIdentifier",
+          "preciseIdentifier": "c:b",
+          "spelling": "bool"
+        },
+        {
+          "kind": "text",
+          "spelling": " "
+        },
+        {
+          "kind": "identifier",
+          "spelling": "Foo"
+        },
+        {
+          "kind": "text",
+          "spelling": ";"
+        }
+      ],
+      "identifier": {
+        "interfaceLanguage": "c",
+        "precise": "c:@Foo"
+      },
+      "kind": {
+        "displayName": "Global Variable",
+        "identifier": "c.var"
+      },
+      "location": {
+        "position": {
+          "character": 6,
+          "line": 2
+        },
+        "uri": "file://INPUT_DIR/input.h"
+      },
+      "names": {
+        "navigator": [
+          {
+            "kind": "identifier",
+            "spelling": "Foo"
+          }
+        ],
+        "subHeading": [
+          {
+            "kind": "identifier",
+            "spelling": "Foo"
+          }
+        ],
+        "title": "Foo"
+      },
+      "pathComponents": [
+        "Foo"
+      ]
+    },
+    {
+      "accessLevel": "public",
+      "declarationFragments": [
+        {
+          "kind": "typeIdentifier",
+          "preciseIdentifier": "c:b",
+          "spelling": "bool"
+        },
+        {
+          "kind": "text",
+          "spelling": " "
+        },
+        {
+          "kind": "identifier",
+          "spelling": "IsFoo"
+        },
+        {
+          "kind": "text",
+          "spelling": "("
+        },
+        {
+          "kind": "typeIdentifier",
+          "preciseIdentifier": "c:b",
+          "spelling": "bool"
+        },
+        {
+          "kind": "text",
+          "spelling": " "
+        },
+        {
+          "kind": "internalParam",
+          "spelling": "Bar"
+        },
+        {
+          "kind": "text",
+          "spelling": ");"
+        }
+      ],
+      "functionSignature": {
+        "parameters": [
+          {
+            "declarationFragments": [
+              {
+                "kind": "typeIdentifier",
+                "preciseIdentifier": "c:b",
+                "spelling": "bool"
+              },
+              {
+                "kind": "text",
+                "spelling": " "
+              },
+              {
+                "kind": "internalParam",
+                "spelling": "Bar"
+              }
+            ],
+            "name": "Bar"
+          }
+        ],
+        "returns": [
+          {
+            "kind": "typeIdentifier",
+            "preciseIdentifier": "c:b",
+            "spelling": "bool"
+          }
+        ]
+      },
+      "identifier": {
+        "interfaceLanguage": "c",
+        "precise": "c:@F@IsFoo"
+      },
+      "kind": {
+        "displayName": "Function",
+        "identifier": "c.func"
+      },
+      "location": {
+        "position": {
+          "character": 6,
+          "line": 4
+        },
+        "uri": "file://INPUT_DIR/input.h"
+      },
+      "names": {
+        "navigator": [
+          {
+            "kind": "identifier",
+            "spelling": "IsFoo"
+          }
+        ],
+        "subHeading": [
+          {
+            "kind": "identifier",
+            "spelling": "IsFoo"
+          }
+        ],
+        "title": "IsFoo"
+      },
+      "pathComponents": [
+        "IsFoo"
+      ]
+    }
+  ]
+}
diff --git a/clang/test/ExtractAPI/bool.cpp b/clang/test/ExtractAPI/bool.cpp
new file mode 100644
--- /dev/null
+++ b/clang/test/ExtractAPI/bool.cpp
@@ -0,0 +1,203 @@
+// RUN: rm -rf %t
+// RUN: split-file %s %t
+// RUN: sed -e "s@INPUT_DIR@%{/t:regex_replacement}@g" \
+// RUN: %t/reference.output.json.in >> %t/reference.output.json
+// RUN: %clang_cc1 -extract-api -triple arm64-apple-macosx \
+// RUN:   -x c++-header %t/input.h -o %t/output.json -verify
+
+// Generator version is not consistent across test runs, normalize it.
+// RUN: sed -e "s@\"generator\": \".*\"@\"generator\": \"?\"@g" \
+// RUN: %t/output.json >> %t/output-normalized.json
+// RUN: diff %t/reference.output.json %t/output-normalized.json
+
+//--- input.h
+bool Foo;
+
+bool IsFoo(bool Bar);
+/// expected-no-diagnostics
+
+//--- reference.output.json.in
+{
+  "metadata": {
+    "formatVersion": {
+      "major": 0,
+      "minor": 5,
+      "patch": 3
+    },
+    "generator": "?"
+  },
+  "module": {
+    "name": "",
+    "platform": {
+      "architecture": "arm64",
+      "operatingSystem": {
+        "minimumVersion": {
+          "major": 11,
+          "minor": 0,
+          "patch": 0
+        },
+        "name": "macosx"
+      },
+      "vendor": "apple"
+    }
+  },
+  "relationships": [],
+  "symbols": [
+    {
+      "accessLevel": "public",
+      "declarationFragments": [
+        {
+          "kind": "typeIdentifier",
+          "preciseIdentifier": "c:b",
+          "spelling": "bool"
+        },
+        {
+          "kind": "text",
+          "spelling": " "
+        },
+        {
+          "kind": "identifier",
+          "spelling": "Foo"
+        },
+        {
+          "kind": "text",
+          "spelling": ";"
+        }
+      ],
+      "identifier": {
+        "interfaceLanguage": "c++",
+        "precise": "c:@Foo"
+      },
+      "kind": {
+        "displayName": "Global Variable",
+        "identifier": "c++.var"
+      },
+      "location": {
+        "position": {
+          "character": 6,
+          "line": 1
+        },
+        "uri": "file://INPUT_DIR/input.h"
+      },
+      "names": {
+        "navigator": [
+          {
+            "kind": "identifier",
+            "spelling": "Foo"
+          }
+        ],
+        "subHeading": [
+          {
+            "kind": "identifier",
+            "spelling": "Foo"
+          }
+        ],
+        "title": "Foo"
+      },
+      "pathComponents": [
+        "Foo"
+      ]
+    },
+    {
+      "accessLevel": "public",
+      "declarationFragments": [
+        {
+          "kind": "typeIdentifier",
+          "preciseIdentifier": "c:b",
+          "spelling": "bool"
+        },
+        {
+          "kind": "text",
+          "spelling": " "
+        },
+        {
+          "kind": "identifier",
+          "spelling": "IsFoo"
+        },
+        {
+          "kind": "text",
+          "spelling": "("
+        },
+        {
+          "kind": "typeIdentifier",
+          "preciseIdentifier": "c:b",
+          "spelling": "bool"
+        },
+        {
+          "kind": "text",
+          "spelling": " "
+        },
+        {
+          "kind": "internalParam",
+          "spelling": "Bar"
+        },
+        {
+          "kind": "text",
+          "spelling": ");"
+        }
+      ],
+      "functionSignature": {
+        "parameters": [
+          {
+            "declarationFragments": [
+              {
+                "kind": "typeIdentifier",
+                "preciseIdentifier": "c:b",
+                "spelling": "bool"
+              },
+              {
+                "kind": "text",
+                "spelling": " "
+              },
+              {
+                "kind": "internalParam",
+                "spelling": "Bar"
+              }
+            ],
+            "name": "Bar"
+          }
+        ],
+        "returns": [
+          {
+            "kind": "typeIdentifier",
+            "preciseIdentifier": "c:b",
+            "spelling": "bool"
+          }
+        ]
+      },
+      "identifier": {
+        "interfaceLanguage": "c++",
+        "precise": "c:@F@IsFoo#b#"
+      },
+      "kind": {
+        "displayName": "Function",
+        "identifier": "c++.func"
+      },
+      "location": {
+        "position": {
+          "character": 6,
+          "line": 3
+        },
+        "uri": "file://INPUT_DIR/input.h"
+      },
+      "names": {
+        "navigator": [
+          {
+            "kind": "identifier",
+            "spelling": "IsFoo"
+          }
+        ],
+        "subHeading": [
+          {
+            "kind": "identifier",
+            "spelling": "IsFoo"
+          }
+        ],
+        "title": "IsFoo"
+      },
+      "pathComponents": [
+        "IsFoo"
+      ]
+    }
+  ]
+}