diff --git a/src/eval.c b/src/eval.c
index 0468203..14ba4d8 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -16934,7 +16934,7 @@
     typval_T	*argvars UNUSED;
     typval_T	*rettv;
 {
-    rettv->vval.v_number = get_sw_value();
+    rettv->vval.v_number = get_sw_value(curbuf);
 }
 
 /*