diff --git a/tests/ert/unit_tests/config/test_forward_model.py b/tests/ert/unit_tests/config/test_forward_model.py
index e93c4263d76..343db2829e5 100644
--- a/tests/ert/unit_tests/config/test_forward_model.py
+++ b/tests/ert/unit_tests/config/test_forward_model.py
@@ -1037,7 +1037,7 @@ def __init__(self):
             super().__init__(name="FMWithAssertionError", command=["the_executable.sh"])
 
         def validate_pre_experiment(
-            self, fm_step_json: ForwardModelStepJSON, _: dict
+            self, fm_step_json: ForwardModelStepJSON, _: Dict[str, str]
         ) -> None:
             raise AssertionError("I should be a warning")
 
@@ -1049,7 +1049,7 @@ def __init__(self):
             )
 
         def validate_pre_experiment(
-            self, fm_step_json: ForwardModelStepJSON, _: dict
+            self, fm_step_json: ForwardModelStepJSON, _: Dict[str, str]
         ) -> None:
             raise ForwardModelStepValidationError("I should not be a warning")