diff --git a/src/option.h b/src/option.h
index 54ae889..b59c0e2 100644
--- a/src/option.h
+++ b/src/option.h
@@ -515,6 +515,7 @@
 #endif
 #if defined(FEAT_GUI)
 EXTERN char_u	*p_go;		/* 'guioptions' */
+EXTERN char_u	*p_gtl;		/* 'guitablabel' */
 #endif
 EXTERN char_u	*p_hf;		/* 'helpfile' */
 #ifdef FEAT_WINDOWS