diff --git a/Lib/unittest/mock.py b/Lib/unittest/mock.py
index cbc4d76..497aa6f 100644
--- a/Lib/unittest/mock.py
+++ b/Lib/unittest/mock.py
@@ -1974,9 +1974,9 @@
         method.return_value = fixed
         return
 
-    return_calulator = _calculate_return_value.get(name)
-    if return_calulator is not None:
-        return_value = return_calulator(mock)
+    return_calculator = _calculate_return_value.get(name)
+    if return_calculator is not None:
+        return_value = return_calculator(mock)
         method.return_value = return_value
         return