diff --git a/example/src/c.nub b/example/src/c.nub
index c0a5b4c..b5b09da 100644
--- a/example/src/c.nub
+++ b/example/src/c.nub
@@ -1,4 +1,4 @@
 namespace c
 
-// extern func printf(fmt: cstring, arg: u64): void
+extern func printf(fmt: cstring, arg: i64): void
 extern func puts(fmt: cstring)