diff --git a/sim/dex.ts b/sim/dex.ts
index 2d468d7bdc..7bc0590029 100644
--- a/sim/dex.ts
+++ b/sim/dex.ts
@@ -165,7 +165,7 @@ export class ModdedDex {
 
 	mod(mod: string | undefined): ModdedDex {
 		if (!dexes['base'].modsLoaded) dexes['base'].includeMods();
-		return dexes[mod || 'base'];
+		return dexes[mod || 'base'].includeData();
 	}
 
 	forGen(gen: number) {
diff --git a/test/sim/dex.js b/test/sim/dex.js
index e8c0f3aaef..b15e77b64b 100644
--- a/test/sim/dex.js
+++ b/test/sim/dex.js
@@ -3,6 +3,14 @@
 const assert = require('./../assert');
 
 describe('Mod loader', function () {
+	it('should always provide accurate gen information', function () {
+		{
+			const Dex = require('./../../dist/sim/dex').Dex;
+			assert.equal(Dex.mod('gen2').gen, 2);
+			assert.equal(Dex.forFormat('gen1randombattle').gen, 1);
+		}
+	});
+
 	it('should work fine in any order', function () {
 		{
 			const Dex = require('./../../dist/sim/dex').Dex;