diff --git a/backend/services/falukantService.js b/backend/services/falukantService.js
index e243dff..1d10aba 100644
--- a/backend/services/falukantService.js
+++ b/backend/services/falukantService.js
@@ -212,7 +212,7 @@ async function calcRegionalSellPrice(product, knowledgeFactor, regionId, worthPe
                 JOIN falukant_type.region rt2 ON rt2.id = reg.region_type_id
                 JOIN ancestors a ON reg.id = a.parent_id
             )
-            SELECT COALESCE(SUM(CASE WHEN ${exemptTypesString} && ARRAY[region_type] THEN 0 ELSE tax_percent END),0) AS total FROM ancestors;`,
+            SELECT COALESCE(SUM(CASE WHEN ${exemptTypesString} && ARRAY[region_type]::text[] THEN 0 ELSE tax_percent END),0) AS total FROM ancestors;`,
             {
                 replacements: { id: regionId },
                 type: sequelize.QueryTypes.SELECT