diff --git a/clang/lib/AST/ByteCode/Interp.cpp b/clang/lib/AST/ByteCode/Interp.cpp
index fdc4b38b8aa6d..c8ce08aa3eef2 100644
--- a/clang/lib/AST/ByteCode/Interp.cpp
+++ b/clang/lib/AST/ByteCode/Interp.cpp
@@ -507,8 +507,8 @@ bool CheckMutable(InterpState &S, CodePtr OpPC, const Pointer &Ptr) {
   return false;
 }
 
-bool CheckVolatile(InterpState &S, CodePtr OpPC, const Pointer &Ptr,
-                   AccessKinds AK) {
+static bool CheckVolatile(InterpState &S, CodePtr OpPC, const Pointer &Ptr,
+                          AccessKinds AK) {
   assert(Ptr.isLive());
 
   // FIXME: This check here might be kinda expensive. Maybe it would be better