diff --git a/biogascontrollerapp/lib/com.py b/biogascontrollerapp/lib/com.py
index 89ebf2e..f480857 100644
--- a/biogascontrollerapp/lib/com.py
+++ b/biogascontrollerapp/lib/com.py
@@ -69,7 +69,7 @@ class Com(ComSuperClass):
             # Filter for specific controller
             for comport in ports:
                 for filter in self._filters:
-                    if ( filter in comport ):
+                    if filter in comport:
                         return comport
         except Exception as e:
             self._err = e