diff --git a/backend/right_tree/api/management/commands/_spreadsheet_constants.py b/backend/right_tree/api/management/commands/_spreadsheet_constants.py
index f211ebc..6ffbaa5 100644
--- a/backend/right_tree/api/management/commands/_spreadsheet_constants.py
+++ b/backend/right_tree/api/management/commands/_spreadsheet_constants.py
@@ -57,7 +57,7 @@ ECO_REGION_PK_MAPPING = get_pk_mapping(EcologicalRegion)
 SOIL_ORDER_PK_MAPPING = get_pk_mapping(SoilOrder)
 SOIL_VARIANT_PK_MAPPING = get_pk_mapping(SoilVariant)
 TOLERANCE_PK_MAPPING = get_pk_mapping(ToleranceLevel, "level")
-ZONE_PK_MAPPING = get_zone_pk_mapping(Zone)
+ZONE_PK_MAPPING = get_zone_pk_mapping()
 
 # Spreadsheet and corresponding value to column index mappings
 SPREADSHEET = get_spreadsheet(DATA_DIR_PATH, SPREADSHEET_FILENAME)
diff --git a/backend/right_tree/api/management/commands/_spreadsheet_helpers.py b/backend/right_tree/api/management/commands/_spreadsheet_helpers.py
index aadc167..9180da5 100644
--- a/backend/right_tree/api/management/commands/_spreadsheet_helpers.py
+++ b/backend/right_tree/api/management/commands/_spreadsheet_helpers.py
@@ -12,14 +12,10 @@ def get_pk_mapping(object, mapping_key="name"):
     return pk_mapping
 
 
-def get_zone_pk_mapping(zone_model):
+def get_zone_pk_mapping():
     """ Maps the string instance (unique) of a zone to its corresponding primary key.
     """
-    zone_pk_mapping = {}
-    for instance in zone_model.objects.all():
-        zone_pk_mapping[str(instance)] = instance.pk
-
-    return zone_pk_mapping
+    return {str(instance): instance.pk for instance in Zone.objects.all()}
 
 
 def get_col_mappings(sheet, start_col, stop_col, row_index):