diff --git a/src/bus/interface.cpp b/src/bus/interface.cpp
index 8560b3b..69c1900 100644
--- a/src/bus/interface.cpp
+++ b/src/bus/interface.cpp
@@ -18,8 +18,8 @@ namespace sta
 
     void Interface::release()
     {
-        mutex_->release();
         acquired_ = false;
+        mutex_->release();
     }
 
     bool Interface::isAcquired()