diff --git a/lib/config.py b/lib/config.py
index c5d1a6ab091a5accf3b615e907fefc50f8fcff76..c72ca6227e50c9fd3a722363348b5cc6d1c78ecc 100644
--- a/lib/config.py
+++ b/lib/config.py
@@ -81,7 +81,7 @@ class TemporaryReservationManager:
     self._ec_reserved = {}
 
   def Reserved(self, resource):
-    for holder_reserved in self._ec_reserved.items():
+    for holder_reserved in self._ec_reserved.values():
       if resource in holder_reserved:
         return True
     return False