diff --git a/interface/TextMiningService.py b/interface/TextMiningService.py
index 981c58468507111417f7a4c7a2b27d1ce1b10e81..89b1ea33c81a48f2c5b524854192e43e5fe98e9f 100644
--- a/interface/TextMiningService.py
+++ b/interface/TextMiningService.py
@@ -17,11 +17,11 @@ class TextMiningService(metaclass=ABCMeta):
         self.description = description
     
     @abstractmethod
-    def getMentions(entities: List) -> List[Publication]:
+    def getMentions(self, entities: List) -> List[Publication]:
         pass
 
     @abstractmethod
-    def getCoOccurrences(entity: str) -> List[str]:
+    def getCoOccurrences(self, entity: str) -> List[str]:
         pass