diff --git a/example/interpolation.plm b/example/interpolation.plm
index fd5fac8..3c7f6de 100644
--- a/example/interpolation.plm
+++ b/example/interpolation.plm
@@ -1,4 +1,4 @@
-fn welcome(name: str): unit {
+fn welcome(name: str) {
   println("Hello, $name!")
 }