diff --git a/test/test_runner_battle.c b/test/test_runner_battle.c
index 20271a588d..bfbf4c899d 100644
--- a/test/test_runner_battle.c
+++ b/test/test_runner_battle.c
@@ -1341,6 +1341,18 @@ void TestRunner_Battle_AfterLastTurn(void)
 
 static void TearDownBattle(void)
 {
+    // Zero out the parties, data in them could potentially carry over
+    for (u32 i = 0; i < 6; i++)
+    {
+        u32 *playerPtr = (u32 *)(&gPlayerParty[i]);
+        u32 *opponentPtr = (u32 *)(&gEnemyParty[i]);
+        for (u32 j = 0; j < sizeof(struct Pokemon)/4; j++)
+        {
+            playerPtr[j] = 0;
+            opponentPtr[j] = 0;
+        }
+    }
+
     FreeMonSpritesGfx();
     FreeBattleSpritesData();
     FreeBattleResources();