diff --git a/src/main/py/logical_operations.py b/src/main/py/logical_operations.py
index a044004..6cbd64b 100644
--- a/src/main/py/logical_operations.py
+++ b/src/main/py/logical_operations.py
@@ -1,5 +1,5 @@
-def identity_conjunctive(variable, zero):
-    if zero == 0:
+def identity_conjunctive(variable, operator, zero):
+    if zero == 0 and operator == "+":
         return variable
     else:
         return None
diff --git a/src/test/py/test_logical_operations.py b/src/test/py/test_logical_operations.py
index 35a7c7c..84bdaaf 100644
--- a/src/test/py/test_logical_operations.py
+++ b/src/test/py/test_logical_operations.py
@@ -10,16 +10,16 @@ class calculationsWithRoots(unittest.TestCase):
         pass
 
     def test_disconjunctive_identity_1_and_0_equals_x(self):
-        self.assertEqual(identity_conjunctive(1, 0), 1)
+        self.assertEqual(identity_conjunctive(1, "+", 0), 1)
 
     def test_disconjunctive_identity_1_and_1_equals_None(self):
-        self.assertEqual(identity_conjunctive(1, 1), None)
+        self.assertEqual(identity_conjunctive(1, "+", 1), None)
 
     def test_disconjunctive_identity_0_and_1_equals_None(self):
-        self.assertEqual(identity_conjunctive(0, 1), None)
+        self.assertEqual(identity_conjunctive(0, "+", 1), None)
 
     def test_disconjunctive_identity_0_and_0_equals_0(self):
-        self.assertEqual(identity_conjunctive(0, 0), 0)
+        self.assertEqual(identity_conjunctive(0, "+", 0), 0)
 
 
 if __name__ == "__main__":