diff --git a/src/gamelib_adapter.js b/src/gamelib_adapter.js
index 45fd4f6..de1be33 100644
--- a/src/gamelib_adapter.js
+++ b/src/gamelib_adapter.js
@@ -88,18 +88,21 @@ export class GamelibAdapter {
 
         for (let i = 0; i < args.length; i++) {
             const expectedType = typeAliases[expectedTypes[i]] ?? expectedTypes[i];
+            let expectedTypeName = typeAliases[expectedTypes[i]] ? expectedTypes[i] : null;
 
             if (typeof expectedType === "string" && typeof args[i] !== expectedType) {
+                expectedTypeName ??= expectedType;
+
                 this.#error(
                     `Expected parameter #${
                         i + 1
-                    } to be of type ${expectedType}, got ${typeof args[i]}`,
+                    } to be of type ${expectedTypeName}, got ${typeof args[i]}`,
                     func,
                 );
             }
 
             if (expectedType instanceof Object && !(args[i] instanceof expectedType)) {
-                const expectedTypeName = expectedType.prototype.constructor.name;
+                expectedTypeName ??= expectedType.prototype.constructor.name;
 
                 this.#error(
                     `Expected parameter #${