diff --git a/src/highlight.c b/src/highlight.c
index 564cf3a..40dda64 100644
--- a/src/highlight.c
+++ b/src/highlight.c
@@ -3796,7 +3796,7 @@
 	    }
 	    else
 	    {
-		emsg(_("List or number required"));
+		emsg(_("E290: List or number required"));
 		goto fail;
 	    }
 	    if (toplnum == 0 || lnum < toplnum)