diff --git a/clang/lib/Tooling/Syntax/BuildTree.cpp b/clang/lib/Tooling/Syntax/BuildTree.cpp
--- a/clang/lib/Tooling/Syntax/BuildTree.cpp
+++ b/clang/lib/Tooling/Syntax/BuildTree.cpp
@@ -15,6 +15,7 @@
 #include "clang/AST/ExprCXX.h"
 #include "clang/AST/RecursiveASTVisitor.h"
 #include "clang/AST/Stmt.h"
+#include "clang/AST/StmtIterator.h"
 #include "clang/AST/TypeLoc.h"
 #include "clang/AST/TypeLocVisitor.h"
 #include "clang/Basic/LLVM.h"
@@ -1007,23 +1008,24 @@
   }
 
   bool TraverseCXXOperatorCallExpr(CXXOperatorCallExpr *S) {
-    if (getOperatorNodeKind(*S) ==
-        syntax::NodeKind::PostfixUnaryOperatorExpression) {
+    for (auto *child : S->children()) {
       // A postfix unary operator is declared as taking two operands. The
       // second operand is used to distinguish from its prefix counterpart. In
       // the semantic AST this "phantom" operand is represented as a
       // `IntegerLiteral` with invalid `SourceLocation`. We skip visiting this
       // operand because it does not correspond to anything written in source
       // code
-      for (auto *child : S->children()) {
-        if (child->getSourceRange().isInvalid())
-          continue;
-        if (!TraverseStmt(child))
-          return false;
+      if (child->getSourceRange().isInvalid()) {
+        assert(getOperatorNodeKind(*S) ==
+               syntax::NodeKind::PostfixUnaryOperatorExpression);
+        continue;
       }
-      return WalkUpFromCXXOperatorCallExpr(S);
-    } else
-      return RecursiveASTVisitor::TraverseCXXOperatorCallExpr(S);
+      if (child->getBeginLoc() == S->getOperatorLoc())
+        continue;
+      if (!TraverseStmt(child))
+        return false;
+    }
+    return WalkUpFromCXXOperatorCallExpr(S);
   }
 
   bool WalkUpFromCXXOperatorCallExpr(CXXOperatorCallExpr *S) {
diff --git a/clang/unittests/Tooling/Syntax/TreeTest.cpp b/clang/unittests/Tooling/Syntax/TreeTest.cpp
--- a/clang/unittests/Tooling/Syntax/TreeTest.cpp
+++ b/clang/unittests/Tooling/Syntax/TreeTest.cpp
@@ -2592,9 +2592,7 @@
     | | |-IdExpression
     | | | `-UnqualifiedId
     | | |   `-x
-    | | |-IdExpression
-    | | | `-UnqualifiedId
-    | | |   `-=
+    | | |-=
     | | `-IdExpression
     | |   `-UnqualifiedId
     | |     `-y
@@ -2605,9 +2603,7 @@
     | | | `-IdExpression
     | | |   `-UnqualifiedId
     | | |     `-x
-    | | |-IdExpression
-    | | | `-UnqualifiedId
-    | | |   `-+
+    | | |-+
     | | `-IdExpression
     | |   `-UnqualifiedId
     | |     `-y
@@ -2617,9 +2613,7 @@
     | | |-IdExpression
     | | | `-UnqualifiedId
     | | |   `-x
-    | | |-IdExpression
-    | | | `-UnqualifiedId
-    | | |   `-<
+    | | |-<
     | | `-IdExpression
     | |   `-UnqualifiedId
     | |     `-y
@@ -2629,9 +2623,7 @@
     | | |-IdExpression
     | | | `-UnqualifiedId
     | | |   `-x
-    | | |-IdExpression
-    | | | `-UnqualifiedId
-    | | |   `-<<
+    | | |-<<
     | | `-IdExpression
     | |   `-UnqualifiedId
     | |     `-y
@@ -2641,9 +2633,7 @@
     | | |-IdExpression
     | | | `-UnqualifiedId
     | | |   `-x
-    | | |-IdExpression
-    | | | `-UnqualifiedId
-    | | |   `-,
+    | | |-,
     | | `-IdExpression
     | |   `-UnqualifiedId
     | |     `-y
@@ -2730,27 +2720,21 @@
     |-{
     |-ExpressionStatement
     | |-PrefixUnaryOperatorExpression
-    | | |-IdExpression
-    | | | `-UnqualifiedId
-    | | |   `-++
+    | | |-++
     | | `-IdExpression
     | |   `-UnqualifiedId
     | |     `-x
     | `-;
     |-ExpressionStatement
     | |-PrefixUnaryOperatorExpression
-    | | |-IdExpression
-    | | | `-UnqualifiedId
-    | | |   `-!
+    | | |-!
     | | `-IdExpression
     | |   `-UnqualifiedId
     | |     `-x
     | `-;
     |-ExpressionStatement
     | |-PrefixUnaryOperatorExpression
-    | | |-IdExpression
-    | | | `-UnqualifiedId
-    | | |   `-&
+    | | |-&
     | | `-IdExpression
     | |   `-UnqualifiedId
     | |     `-x
@@ -2809,9 +2793,7 @@
     | | |-IdExpression
     | | | `-UnqualifiedId
     | | |   `-x
-    | | `-IdExpression
-    | |   `-UnqualifiedId
-    | |     `-++
+    | | `-++
     | `-;
     `-}
 )txt"));