diff --git a/index.ts b/index.ts
index 71c6157d..c1004eb5 100644
--- a/index.ts
+++ b/index.ts
@@ -623,7 +623,7 @@ class ServerlessCustomDomain {
         // Use APIGateway (v1) for EDGE domains
         if (domain.endpointType === Globals.endpointTypes.edge) {
             const params = {
-                basePath: domain.apiMapping.ApiMappingKey,
+                basePath: domain.apiMapping.ApiMappingKey || "(none)",
                 domainName: domain.givenDomainName,
                 patchOperations: [
                     {