1 files changed, 1 insertions, 1 deletions
diff --git a/ack.kpl b/ack.kpl
index 80a3a74..1eb7694 100644
--- a/ack.kpl
+++ b/ack.kpl
@@ -3,7 +3,7 @@
 
 `export ack : Fn[m; n] $ (
     ? !=(`type m; `type n) {
-        `exit "m and n must be the same type and above zero"
+        `panic "m and n must be the same type"
     }
     ? {
         m = 0 { n + 1 }