diff --git a/src/eddn/Monitor.py b/src/eddn/Monitor.py
index dc7bb5d..dce2afb 100644
--- a/src/eddn/Monitor.py
+++ b/src/eddn/Monitor.py
@@ -229,7 +229,7 @@ class Monitor(Thread):
 
             # Duplicates?
             if Settings.RELAY_DUPLICATE_MAX_MINUTES:
-                if duplicate_messages.isDuplicated(json):
+                if duplicate_messages.is_duplicated(json):
                     schema_id = 'DUPLICATE MESSAGE'
 
                     c = db.cursor()
diff --git a/src/eddn/Relay.py b/src/eddn/Relay.py
index 3ff289d..83624dc 100644
--- a/src/eddn/Relay.py
+++ b/src/eddn/Relay.py
@@ -156,7 +156,7 @@ class Relay(Thread):
 
             # Handle duplicate message
             if Settings.RELAY_DUPLICATE_MAX_MINUTES:
-                if duplicate_messages.isDuplicated(json):
+                if duplicate_messages.is_duplicated(json):
                     # We've already seen this message recently. Discard it.
                     stats_collector.tally("duplicate")
                     return
diff --git a/src/eddn/core/DuplicateMessages.py b/src/eddn/core/DuplicateMessages.py
index c3447b5..d2475c7 100644
--- a/src/eddn/core/DuplicateMessages.py
+++ b/src/eddn/core/DuplicateMessages.py
@@ -36,7 +36,7 @@ class DuplicateMessages(Thread):
                     if self.caches[key] + timedelta(minutes=self.max_minutes) < max_time:
                         del self.caches[key]
 
-    def isDuplicated(self, json):
+    def is_duplicated(self, json):
         with self.lock:
             # Test messages are never duplicate, would be a pain to wait for another test :D
             if re.search('test', json['$schemaRef'], re.I):