Index: clang/lib/Format/Format.cpp
===================================================================
--- clang/lib/Format/Format.cpp
+++ clang/lib/Format/Format.cpp
@@ -2590,8 +2590,18 @@
     auto Pos = Code.find('\n', SearchFrom);
     StringRef Line =
         Code.substr(Prev, (Pos != StringRef::npos ? Pos : Code.size()) - Prev);
-
     StringRef Trimmed = Line.trim();
+
+    // #includes inside raw string literals need to be ignored.
+    // or we will sort the contents of the string.
+    // Skip past until we think we we the rawstring literal close.
+    if (Trimmed.contains("R\"(")) {
+      FormattingOff = true;
+    }
+    if (Trimmed.contains(")\"")) {
+      FormattingOff = false;
+    }
+
     if (Trimmed == "// clang-format off" || Trimmed == "/* clang-format off */")
       FormattingOff = true;
     else if (Trimmed == "// clang-format on" ||
Index: clang/unittests/Format/SortIncludesTest.cpp
===================================================================
--- clang/unittests/Format/SortIncludesTest.cpp
+++ clang/unittests/Format/SortIncludesTest.cpp
@@ -1045,6 +1045,37 @@
   EXPECT_EQ(Unsorted, sort(Unsorted, "input.cpp", 0));
 }
 
+TEST_F(SortIncludesTest, DisableRawStringLiteralSorting) {
+
+  EXPECT_EQ("const char *t = R\"(\n"
+            "#include <b.h>\n"
+            "#include <a.h>\n"
+            ")\";",
+            sort("const char *t = R\"(\n"
+                 "#include <b.h>\n"
+                 "#include <a.h>\n"
+                 ")\";",
+                 "test.cxx", 0));
+
+  EXPECT_EQ("#include <a.h>\n"
+            "#include <b.h>\n"
+            "const char *t = R\"(\n"
+            "#include <b.h>\n"
+            "#include <a.h>\n"
+            ")\";\n"
+            "#include <c.h>\n"
+            "#include <d.h>",
+            sort("#include <b.h>\n"
+                 "#include <a.h>\n"
+                 "const char *t = R\"(\n"
+                 "#include <b.h>\n"
+                 "#include <a.h>\n"
+                 ")\";\n"
+                 "#include <d.h>\n"
+                 "#include <c.h>",
+                 "test.cc", 2));
+}
+
 } // end namespace
 } // end namespace format
 } // end namespace clang