diff --git a/src/mbyte.c b/src/mbyte.c
index b797835..545a40d 100644
--- a/src/mbyte.c
+++ b/src/mbyte.c
@@ -4795,12 +4795,11 @@
     static void
 call_imactivatefunc(int active)
 {
-    char_u *argv[1];
+    typval_T argv[2];
 
-    if (active)
-	argv[0] = (char_u *)"1";
-    else
-	argv[0] = (char_u *)"0";
+    argv[0].v_type = VAR_NUMBER;
+    argv[0].vval.v_number = active ? 1 : 0;
+    argv[1].v_type = VAR_NUMBER;
     (void)call_func_retnr(p_imaf, 1, argv, FALSE);
 }