diff --git a/examples/add.rs b/examples/add.rs
index 8ff8676cce..ad01074d1d 100644
--- a/examples/add.rs
+++ b/examples/add.rs
@@ -1,5 +1,5 @@
 #[no_mangle]
-pub extern "C" fn add(a: isize, b: isize) -> isize {
+pub extern "C" fn add(a: i32, b: i32) -> i32 {
     a + b
 }