diff --git a/clang/lib/AST/ASTStructuralEquivalence.cpp b/clang/lib/AST/ASTStructuralEquivalence.cpp
index 7b62eb8..9f83c51 100644
--- a/clang/lib/AST/ASTStructuralEquivalence.cpp
+++ b/clang/lib/AST/ASTStructuralEquivalence.cpp
@@ -528,7 +528,7 @@
     if (Proto1->isVariadic() != Proto2->isVariadic())
       return false;
 
-    if (Proto1->getTypeQuals() != Proto2->getTypeQuals())
+    if (Proto1->getMethodQuals() != Proto2->getMethodQuals())
       return false;
 
     // Check exceptions, this information is lost in canonical type.