diff --git a/hello-world.sex b/hello-world.sex
index 492242a..33a9410 100644
--- a/hello-world.sex
+++ b/hello-world.sex
@@ -1,6 +1,6 @@
 (include stdio.h)
 
-(define (foo)
+(chicken-define (foo)
   "Hello from Chicken code!\n")
 
 (struct foo