diff --git a/src/test/compile-fail/unsupported-cast.rs b/src/test/compile-fail/unsupported-cast.rs
index 205c912f5a098..ca17c898ec37c 100644
--- a/src/test/compile-fail/unsupported-cast.rs
+++ b/src/test/compile-fail/unsupported-cast.rs
@@ -14,5 +14,5 @@
 extern crate libc;
 
 fn main() {
-  println!("{}", 1.0 as *libc::FILE); // Can't cast float to foreign.
+  println!("{:?}", 1.0 as *const libc::FILE); // Can't cast float to foreign.
 }