diff --git a/src/libstd/f32.rs b/src/libstd/f32.rs
index 133540ed6b9ca..7254c62161161 100644
--- a/src/libstd/f32.rs
+++ b/src/libstd/f32.rs
@@ -188,7 +188,7 @@ impl f32 {
         if self.is_nan() {
             NAN
         } else {
-            unsafe { intrinsics::copysignf32(1.0, self) }
+            1.0_f32.copysign(self)
         }
     }
 
diff --git a/src/libstd/f64.rs b/src/libstd/f64.rs
index 87467aeed8b20..f8bb36ad0a89e 100644
--- a/src/libstd/f64.rs
+++ b/src/libstd/f64.rs
@@ -166,7 +166,7 @@ impl f64 {
         if self.is_nan() {
             NAN
         } else {
-            unsafe { intrinsics::copysignf64(1.0, self) }
+            1.0_f64.copysign(self)
         }
     }