diff --git a/xpcom/base/nscore.h b/xpcom/base/nscore.h
index 0ed0256dd7b..39bd5efab59 100644
--- a/xpcom/base/nscore.h
+++ b/xpcom/base/nscore.h
@@ -248,7 +248,7 @@
 #ifdef NS_NO_VTABLE
 #undef NS_NO_VTABLE
 #endif
-#if defined(_MSC_VER) && !defined(__clang__)
+#if defined(_MSC_VER)
 #define NS_NO_VTABLE __declspec(novtable)
 #else
 #define NS_NO_VTABLE