diff --git a/server.py b/server.py
index f4ba7c3..6b45af2 100755
--- a/server.py
+++ b/server.py
@@ -304,7 +304,7 @@ class LogItem():
     def pass_filter(self):
         for filter, filterValue in self.filters.items():
             jsonValue = util.getFields(self.feed, filter)
-            if jsonValue is None or jsonValue != filterValue:
+            if jsonValue is None or ("!" not in filterValue and jsonValue != filterValue) or ("!" in filterValue and jsonValue == filterValue.strip("!")):
                 return False
         return True