diff --git a/tests/compile-fail/intrinsics/float_to_int_64_too_big4.rs b/tests/compile-fail/intrinsics/float_to_int_64_too_big4.rs
index d5b24347b9..e9623dba94 100644
--- a/tests/compile-fail/intrinsics/float_to_int_64_too_big4.rs
+++ b/tests/compile-fail/intrinsics/float_to_int_64_too_big4.rs
@@ -6,5 +6,5 @@ extern "rust-intrinsic" {
 }
 
 fn main() {
-    unsafe { float_to_int_unchecked::<f64, u128>(340282366920938463463374607431768211455.0f64); } //~ ERROR: cannot be represented in target type `u128`
+    unsafe { float_to_int_unchecked::<f64, u128>(u128::MAX as f64); } //~ ERROR: cannot be represented in target type `u128`
 }