diff --git a/clang/lib/Sema/SemaTemplateDeduction.cpp b/clang/lib/Sema/SemaTemplateDeduction.cpp
--- a/clang/lib/Sema/SemaTemplateDeduction.cpp
+++ b/clang/lib/Sema/SemaTemplateDeduction.cpp
@@ -603,7 +603,7 @@
                                  /*NumberOfArgumentsMustMatch=*/true);
 }
 
-static bool IsPossiblyOpaquelyQualifiedType(const Type *T) {
+static bool IsPossiblyOpaquelyQualifiedTypeInternal(const Type *T) {
   assert(T->isCanonicalUnqualified());
 
   switch (T->getTypeClass()) {
@@ -630,7 +630,7 @@
 /// Determines whether the given type is an opaque type that
 /// might be more qualified when instantiated.
 static bool IsPossiblyOpaquelyQualifiedType(QualType T) {
-  return IsPossiblyOpaquelyQualifiedType(
+  return IsPossiblyOpaquelyQualifiedTypeInternal(
       T->getCanonicalTypeInternal().getTypePtr());
 }