diff --git a/clang/lib/Serialization/ASTReaderDecl.cpp b/clang/lib/Serialization/ASTReaderDecl.cpp
index 87e1931ee47fd..8210eb2143acf 100644
--- a/clang/lib/Serialization/ASTReaderDecl.cpp
+++ b/clang/lib/Serialization/ASTReaderDecl.cpp
@@ -4682,8 +4682,8 @@ void ASTDeclReader::UpdateDecl(Decl *D) {
         MSInfo->setPointOfInstantiation(POI);
       } else {
         auto *FD = cast<FunctionDecl>(D);
-        if (auto *FTSInfo = FD->TemplateOrSpecialization
-                    .dyn_cast<FunctionTemplateSpecializationInfo *>())
+        if (auto *FTSInfo = dyn_cast<FunctionTemplateSpecializationInfo *>(
+                FD->TemplateOrSpecialization))
           FTSInfo->setPointOfInstantiation(POI);
         else
           cast<MemberSpecializationInfo *>(FD->TemplateOrSpecialization)