diff --git a/library/std/src/sys/sync/mutex/no_threads.rs b/library/std/src/sys/sync/mutex/no_threads.rs
index 57c78f454c57..a1c2696079f8 100644
--- a/library/std/src/sys/sync/mutex/no_threads.rs
+++ b/library/std/src/sys/sync/mutex/no_threads.rs
@@ -26,6 +26,6 @@ pub unsafe fn unlock(&self) {
 
     #[inline]
     pub fn try_lock(&self) -> bool {
-        self.locked.replace(true) == false
+        !self.locked.replace(true)
     }
 }