diff --git a/mailnews/base/public/msgCore.h b/mailnews/base/public/msgCore.h
index af10a19dd5a..8de1e973176 100644
--- a/mailnews/base/public/msgCore.h
+++ b/mailnews/base/public/msgCore.h
@@ -164,6 +164,7 @@ NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_MAILNEWS, value)
 
 #ifdef MOZ_STATIC_MAIL_BUILD
 #define NS_MSG_BASE
+#define NS_MSG_BASE_STATIC_MEMBER_(type) type
 #else
 
 #ifdef _IMPL_NS_MSG_BASE