diff --git a/src/test/ui/run-pass/union/union-pat-refutability.rs b/src/test/ui/run-pass/union/union-pat-refutability.rs
index f48d8e0d91b0..2c481160fdad 100644
--- a/src/test/ui/run-pass/union/union-pat-refutability.rs
+++ b/src/test/ui/run-pass/union/union-pat-refutability.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 // run-pass
+#![allow(illegal_floating_point_literal_pattern)]
 
 #[repr(u32)]
 enum Tag { I, F }