diff --git a/include/boost/interprocess/detail/os_file_functions.hpp b/include/boost/interprocess/detail/os_file_functions.hpp
index e7f81a5..6ff4cb5 100644
--- a/include/boost/interprocess/detail/os_file_functions.hpp
+++ b/include/boost/interprocess/detail/os_file_functions.hpp
@@ -264,7 +264,8 @@ inline bool try_acquire_file_lock(file_handle_t hnd, bool &acquired)
                acquired = false, true : false;
 
    }
-   return (acquired = true);
+   acquired = true;
+   return true;
 }
 
 inline bool release_file_lock(file_handle_t hnd)
@@ -293,7 +294,9 @@ inline bool try_acquire_file_lock_sharable(file_handle_t hnd, bool &acquired)
       return winapi::get_last_error() == winapi::error_lock_violation ?
                acquired = false, true : false;
    }
-   return (acquired = true);
+   
+   acquired = true;
+   return true;
 }
 
 inline bool release_file_lock_sharable(file_handle_t hnd)