diff --git a/server/routers/hotels/input.ts b/server/routers/hotels/input.ts
index e1bba237c..2158c6b7a 100644
--- a/server/routers/hotels/input.ts
+++ b/server/routers/hotels/input.ts
@@ -1,8 +1,8 @@
 import { z } from "zod"
 
-import { Lang, toUppercaseLang } from "@/constants/languages"
+import { Lang } from "@/constants/languages"
 
 export const getHotelInputSchema = z.object({
   hotelId: z.string(),
-  language: z.nativeEnum(Lang).transform((val) => toUppercaseLang(val)),
+  language: z.nativeEnum(Lang),
 })
diff --git a/server/routers/hotels/query.ts b/server/routers/hotels/query.ts
index 71b7d4de0..7afa53651 100644
--- a/server/routers/hotels/query.ts
+++ b/server/routers/hotels/query.ts
@@ -5,6 +5,7 @@ import { publicProcedure, router } from "@/server/trpc"
 import { getHotelInputSchema } from "./input"
 import { getHotelDataSchema } from "./output"
 import tempHotelData from "./tempHotelData.json"
+import { toApiLang } from "./utils"
 
 export const hotelQueryRouter = router({
   getHotel: publicProcedure
@@ -13,8 +14,9 @@ export const hotelQueryRouter = router({
       const { hotelId, language } = input
 
       const params = new URLSearchParams()
+      const apiLang = toApiLang(language)
       params.set("hotelId", hotelId.toString())
-      params.set("language", language.toString())
+      params.set("language", apiLang)
 
       // TODO: Enable once we have authorized API access.
       // const apiResponse = await api.get(
diff --git a/server/routers/hotels/utils.ts b/server/routers/hotels/utils.ts
new file mode 100644
index 000000000..b9b9e9814
--- /dev/null
+++ b/server/routers/hotels/utils.ts
@@ -0,0 +1,22 @@
+import { Lang } from "@/constants/languages"
+
+const langMap: { [key in Lang]: string } = {
+  [Lang.en]: "En",
+  [Lang.sv]: "Sv",
+  [Lang.no]: "No",
+  [Lang.fi]: "Fi",
+  [Lang.da]: "Da",
+  [Lang.de]: "De",
+}
+
+/**
+ * Helper function to convert Lang enum to uppercase
+ * Needed for the Hotel endpoint.
+ */
+export const toApiLang = (lang: Lang): string => {
+  const result = langMap[lang]
+  if (!result) {
+    throw new Error("Invalid language")
+  }
+  return result
+}