diff --git a/files/cache.py b/files/cache.py
index f584289..d3216d9 100644
--- a/files/cache.py
+++ b/files/cache.py
@@ -42,7 +42,7 @@ def addGroups(self, username:str, matchedGroups:list):
 		'''
 		if username in self.cache:
 			self.logs.info({'message':'Adding groups to the cache.', 'username': username, 'matchedGroups': ','.join(matchedGroups)})
-			self.cache[username]['matchedGroups'] = matchedGroups
+			self.cache[username]['matchedGroups'] = list(set(self.cache[username]['matchedGroups'] + matchedGroups))
 
 	def validateUser(self, username:str, password:str) -> bool:
 		'''