diff --git a/graphene/core/types/tests/test_field.py b/graphene/core/types/tests/test_field.py
index 444e91b52..049ee92c6 100644
--- a/graphene/core/types/tests/test_field.py
+++ b/graphene/core/types/tests/test_field.py
@@ -210,7 +210,7 @@ def att_func_source():
             return True
 
     field = Field(String(), source='att_source', description='My argument')
-    field_func = Field(String(), source='att_source', description='My argument')
+    field_func = Field(String(), source='att_func_source', description='My argument')
 
     class Query(ObjectType):
         att = field