diff --git a/src/eval.c b/src/eval.c
index aab9b0b..76b4159 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -16292,7 +16292,8 @@
 		action = *act;
 	}
 
-	if (l != NULL && set_errorlist(wp, l, action, NULL) == OK)
+	if (l != NULL && set_errorlist(wp, l, action,
+	       (char_u *)(wp == NULL ? "setqflist()" : "setloclist()")) == OK)
 	    rettv->vval.v_number = 0;
     }
 #endif