diff --git a/akm_tools/validation/custom_exceptions.py b/akm_tools/validation/custom_exceptions.py
index 22dfb22..9545c66 100644
--- a/akm_tools/validation/custom_exceptions.py
+++ b/akm_tools/validation/custom_exceptions.py
@@ -11,7 +11,7 @@ def __init__(self, instances: List[Dict]):
 class BaseInstanceOverwiteException(Exception):
     def __init__(self, base_instance, extended_instance):
         err_msg = (
-            f"The extended instace :\n{extended_instance}\nis overwriting properties of base instance\n{base_instance}\n"
+            f"The extended instance :\n{extended_instance}\nis overwriting properties of base instance\n{base_instance}\n"
         )
         super().__init__(err_msg)
         self.message = err_msg
diff --git a/tests/test_custom_exceptions.py b/tests/test_custom_exceptions.py
index 72b9388..81111e0 100644
--- a/tests/test_custom_exceptions.py
+++ b/tests/test_custom_exceptions.py
@@ -26,7 +26,7 @@ def test_BaseInstanceOverwiteException():
         raise BaseInstanceOverwiteException(base_instance, extended_instance)
     assert (
         str(excinfo.value)
-        == f"The extended instace :\n{extended_instance}\nis overwriting properties of base instance\n{base_instance}\n"
+        == f"The extended instance :\n{extended_instance}\nis overwriting properties of base instance\n{base_instance}\n"
     )