diff --git a/src/globals.h b/src/globals.h
index d7d1c08..e883c56 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -223,6 +223,7 @@
 // used by assert_fails()
 EXTERN int	emsg_assert_fails_used INIT(= FALSE);
 EXTERN char_u	*emsg_assert_fails_msg INIT(= NULL);
+EXTERN long	emsg_assert_fails_lnum INIT(= 0);
 
 EXTERN int	did_endif INIT(= FALSE);    // just had ":endif"
 #endif