diff --git a/sopel_SpiceBot_Core_1/SBCore/commands/__init__.py b/sopel_SpiceBot_Core_1/SBCore/commands/__init__.py
index f7b051a..aa35878 100644
--- a/sopel_SpiceBot_Core_1/SBCore/commands/__init__.py
+++ b/sopel_SpiceBot_Core_1/SBCore/commands/__init__.py
@@ -143,7 +143,7 @@ class Commands():
         else:
             return False
 
-    def is_rulematch(function, command_type):
+    def is_rulematch(self, function, command_type):
         """Determine if function could be called with a rule match"""
         rulematch = False
         if command_type == "command":