diff --git a/test/mystery-encounter/encounters/global-trade-system-encounter.test.ts b/test/mystery-encounter/encounters/global-trade-system-encounter.test.ts
index 697040e82d0..f6c5f2bba03 100644
--- a/test/mystery-encounter/encounters/global-trade-system-encounter.test.ts
+++ b/test/mystery-encounter/encounters/global-trade-system-encounter.test.ts
@@ -112,7 +112,7 @@ describe("Global Trade System - Mystery Encounter", () => {
 
       expect(speciesAfter).toBeDefined();
       expect(speciesBefore).not.toBe(speciesAfter);
-      expect(defaultParty).toContain(speciesAfter);
+      expect(defaultParty).not.toContain(speciesAfter);
     });
 
     it("Should trade a Pokemon from the player's party for the second of 3 Pokemon options", async () => {