1 files changed, 2 insertions, 2 deletions
diff --git a/libusb/os/threads_windows.c b/libusb/os/threads_windows.c
index 11b55f9..7762190 100644
--- a/libusb/os/threads_windows.c
+++ b/libusb/os/threads_windows.c
@@ -61,8 +61,8 @@ int usbi_mutex_lock(usbi_mutex_t *mutex) {
 	                         //   so don't know proper errno
 }
 int usbi_mutex_unlock(usbi_mutex_t *mutex) {
-	if(!mutex)               return ((errno=EINVAL));
-	if(!ReleaseMutex(mutex)) return ((errno=EPERM ));
+	if(!mutex)                return ((errno=EINVAL));
+	if(!ReleaseMutex(*mutex)) return ((errno=EPERM ));
 	return 0;
 }