diff --git a/typeid/typeid-js/package.json b/typeid/typeid-js/package.json
index 1cac2de..b950361 100644
--- a/typeid/typeid-js/package.json
+++ b/typeid/typeid-js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "typeid-js",
-  "version": "1.1.0",
+  "version": "1.2.0",
   "description": "Official implementation of the TypeID specification in TypeScript. TypeIDs are type-safe, K-sortable, and globally unique identifiers inspired by Stripe IDs",
   "keywords": [
     "typeid",
diff --git a/typeid/typeid-js/src/typeid.ts b/typeid/typeid-js/src/typeid.ts
index df9e796..599a30e 100644
--- a/typeid/typeid-js/src/typeid.ts
+++ b/typeid/typeid-js/src/typeid.ts
@@ -41,11 +41,11 @@ export class TypeID<const T extends string> {
     return stringify(this.toUUIDBytes());
   }
 
-  public toString(): `${T}_${string}` | string {
+  public toString(): T extends "" ? string : `${T}_${string}` {
     if (this.prefix === "") {
-      return this.suffix;
+      return this.suffix as T extends "" ? string : `${T}_${string}`;
     }
-    return `${this.prefix}_${this.suffix}`;
+    return `${this.prefix}_${this.suffix}` as T extends "" ? string : `${T}_${string}`;
   }
 
   static fromString<const T extends string>(