diff --git a/app/validators/answers/number_answer_validator.py b/app/validators/answers/number_answer_validator.py
index a7f1d046..c99e9258 100644
--- a/app/validators/answers/number_answer_validator.py
+++ b/app/validators/answers/number_answer_validator.py
@@ -70,7 +70,7 @@ def validate_value_in_limits(self):
             answer_ranges = self.questionnaire_schema.numeric_answer_ranges
             referred_answer = (
                 self.questionnaire_schema.get_numeric_value_for_value_source(
-                    min_value, answer_ranges
+                    value_source=min_value, answer_ranges=answer_ranges
                 )
             )
             if referred_answer["min"] < MIN_NUMBER:
@@ -88,7 +88,7 @@ def validate_value_in_limits(self):
             answer_ranges = self.questionnaire_schema.numeric_answer_ranges
             referred_answer = (
                 self.questionnaire_schema.get_numeric_value_for_value_source(
-                    max_value, answer_ranges
+                    value_source=max_value, answer_ranges=answer_ranges
                 )
             )
             if referred_answer["max"] > MAX_NUMBER:
diff --git a/app/validators/questionnaire_schema.py b/app/validators/questionnaire_schema.py
index 1f7b282f..a7ea73c5 100644
--- a/app/validators/questionnaire_schema.py
+++ b/app/validators/questionnaire_schema.py
@@ -547,7 +547,7 @@ def is_block_in_repeating_section(self, block_id: str) -> bool:
         return parent_section and self.is_repeating_section(parent_section["id"])
 
     def get_numeric_value_for_value_source(
-        self, value_source: Mapping[str, str], answer_ranges: Mapping[str, Mapping]
+        self, *, value_source: Mapping[str, str], answer_ranges: Mapping[str, Mapping]
     ) -> Mapping | None:
         referred_answer = None
         answers_to_calculate = self.get_answer_ids_for_value_source(value_source)