diff --git a/clang/lib/Sema/SemaTemplateDeduction.cpp b/clang/lib/Sema/SemaTemplateDeduction.cpp
index 97f8445bf819c..9a55881f64425 100644
--- a/clang/lib/Sema/SemaTemplateDeduction.cpp
+++ b/clang/lib/Sema/SemaTemplateDeduction.cpp
@@ -5514,9 +5514,9 @@ FunctionTemplateDecl *Sema::getMoreSpecializedTemplate(
   QualType Obj2Ty;
   if (TPOC == TPOC_Call) {
     const FunctionProtoType *Proto1 =
-        FD1->getType()->getAs<FunctionProtoType>();
+        FD1->getType()->castAs<FunctionProtoType>();
     const FunctionProtoType *Proto2 =
-        FD2->getType()->getAs<FunctionProtoType>();
+        FD2->getType()->castAs<FunctionProtoType>();
 
     //   - In the context of a function call, the function parameter types are
     //     used.