diff --git a/src/mono/browser/runtime/loader/icu.ts b/src/mono/browser/runtime/loader/icu.ts
index d5ad0dd3b8bbd..20b6a4578f0a3 100644
--- a/src/mono/browser/runtime/loader/icu.ts
+++ b/src/mono/browser/runtime/loader/icu.ts
@@ -66,8 +66,9 @@ export function getIcuResourceName (config: MonoConfig): string | null {
 
         let icuFile = null;
         if (config.globalizationMode === GlobalizationMode.Custom) {
-            if (icuFiles.length === 1) {
-                icuFile = icuFiles[0];
+            // custom ICU file is saved in the resources with fingerprinting and does not require mapping
+            if (icuFiles.length >= 1) {
+                return icuFiles[0];
             }
         } else if (config.globalizationMode === GlobalizationMode.Hybrid) {
             icuFile = "icudt_hybrid.dat";