diff --git a/typescript/src/schema/proto.ts b/typescript/src/schema/proto.ts
index 230aa9eac..ffed121a1 100644
--- a/typescript/src/schema/proto.ts
+++ b/typescript/src/schema/proto.ts
@@ -107,6 +107,9 @@ export class RetryableCodeMap {
     const uniqueName = sortedCodes
       .map(code => this.codeEnumMapping[code])
       .join('_')
+      // toSnakeCase() splits on uppercase and we only want to split on
+      // underscores since all enum codes are uppercase.
+      .toLowerCase()
       .toSnakeCase();
     return uniqueName;
   }