diff --git a/codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/endpoints/AuthSchemePropertyGenerator.java b/codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/endpoints/AuthSchemePropertyGenerator.java
index 8e1f9e46b..e080a1e53 100644
--- a/codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/endpoints/AuthSchemePropertyGenerator.java
+++ b/codegen/smithy-go-codegen/src/main/java/software/amazon/smithy/go/codegen/endpoints/AuthSchemePropertyGenerator.java
@@ -39,7 +39,7 @@ public static String mapEndpointPropertyAuthSchemeName(String name) {
         return switch (name) {
             case "sigv4" -> "aws.auth#sigv4";
             case "sigv4a" -> "aws.auth#sigv4a";
-            default -> throw new IllegalStateException("Unexpected value: " + name);
+            default -> name;
         };
     }