diff --git a/src/FirebaseFS.h b/src/FirebaseFS.h
index 994f023..7380683 100644
--- a/src/FirebaseFS.h
+++ b/src/FirebaseFS.h
@@ -1,7 +1,3 @@
-#include "./core/Firebase_Client_Version.h"
-#if !FIREBASE_CLIENT_VERSION_CHECK(40408)
-#error "Mixed versions compilation."
-#endif
 
 #ifndef FirebaseFS_H
 #define FirebaseFS_H