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-rw-r--r--src/libstd/sys/windows/mutex.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstd/sys/windows/mutex.rs b/src/libstd/sys/windows/mutex.rs
index 3ba19a40d48..a8eb82a8a66 100644
--- a/src/libstd/sys/windows/mutex.rs
+++ b/src/libstd/sys/windows/mutex.rs
@@ -164,7 +164,7 @@ unsafe impl Sync for ReentrantMutex {}
 
 impl ReentrantMutex {
     pub fn uninitialized() -> ReentrantMutex {
-        MaybeUninit::uninitialized()
+        ReentrantMutex { inner: MaybeUninit::uninitialized() }
     }
 
     pub unsafe fn init(&mut self) {