diff --git a/InvenTree/stock/api.py b/InvenTree/stock/api.py
index 9fb3e356a5..20b4a2e36a 100644
--- a/InvenTree/stock/api.py
+++ b/InvenTree/stock/api.py
@@ -353,9 +353,9 @@ class StockFilter(rest_filters.FilterSet):
     name_regex = rest_filters.CharFilter(label='Part name (regex)', field_name='part__name', lookup_expr='iregex')
 
     # Part IPN filters
-    ipn = rest_filters.CharFilter(label='Part IPN (case insensitive)', field_name='part__IPN', lookup_expr='iexact')
-    ipn_contains = rest_filters.CharFilter(label='Part IPN contains (case insensitive)', field_name='part__IPN', lookup_expr='icontains')
-    ipn_regex = rest_filters.CharFilter(label='Part IPN (regex)', field_name='part__IPN', lookup_expr='iregex')
+    IPN = rest_filters.CharFilter(label='Part IPN (case insensitive)', field_name='part__IPN', lookup_expr='iexact')
+    IPN_contains = rest_filters.CharFilter(label='Part IPN contains (case insensitive)', field_name='part__IPN', lookup_expr='icontains')
+    IPN_regex = rest_filters.CharFilter(label='Part IPN (regex)', field_name='part__IPN', lookup_expr='iregex')
 
     # Part attribute filters
     assembly = rest_filters.BooleanFilter(label="Assembly", field_name='part__assembly')