diff --git a/src/libcore/num/wrapping.rs b/src/libcore/num/wrapping.rs
index b7ca497db18..69c22229490 100644
--- a/src/libcore/num/wrapping.rs
+++ b/src/libcore/num/wrapping.rs
@@ -123,6 +123,7 @@ fn mul(self, other: Wrapping<$t>) -> Wrapping<$t> {
         impl Not for Wrapping<$t> {
             type Output = Wrapping<$t>;
 
+            #[inline(always)]
             fn not(self) -> Wrapping<$t> {
                 Wrapping(!self.0)
             }