diff --git a/shared/lib/citizenship-workflow.ts b/shared/lib/citizenship-workflow.ts
index 9ba9351b..03bcc41b 100644
--- a/shared/lib/citizenship-workflow.ts
+++ b/shared/lib/citizenship-workflow.ts
@@ -790,7 +790,8 @@ export async function getPendingApprovalsForReferrer(
       let referrerSS58 = '';
       try {
         if (appData.referrer) {
-          referrerSS58 = encodeAddress(appData.referrer as string, 42);
+          const ss58Prefix = api.registry.chainSS58 ?? 42;
+          referrerSS58 = encodeAddress(appData.referrer as string, ss58Prefix);
         }
       } catch {
         referrerSS58 = appData.referrer?.toString() ?? '';
diff --git a/shared/lib/referral.ts b/shared/lib/referral.ts
index 87fbda40..9d16ac67 100644
--- a/shared/lib/referral.ts
+++ b/shared/lib/referral.ts
@@ -166,7 +166,7 @@ export async function getReferralInfo(
     // toJSON() returns hex for AccountId, convert to SS58
     let referrerSS58 = data.referrer ?? '';
     try {
-      if (data.referrer) referrerSS58 = encodeAddress(data.referrer, 42);
+      if (data.referrer) referrerSS58 = encodeAddress(data.referrer, api.registry.chainSS58 ?? 42);
     } catch { /* keep hex as fallback */ }
     return {
       referrer: referrerSS58,
@@ -274,7 +274,7 @@ export async function getMyReferrals(
         // toJSON() returns hex for AccountId, convert to SS58 for comparison
         let refSS58 = '';
         try {
-          if (data.referrer) refSS58 = encodeAddress(data.referrer, 42);
+          if (data.referrer) refSS58 = encodeAddress(data.referrer, api.registry.chainSS58 ?? 42);
         } catch {
           refSS58 = data.referrer ?? '';
         }