diff --git a/src/battle_script_commands.c b/src/battle_script_commands.c
index b202cd9850..b198d4b589 100755
--- a/src/battle_script_commands.c
+++ b/src/battle_script_commands.c
@@ -15285,34 +15285,55 @@ void BS_SetTerrain(void)
     switch (GetMoveEffect(gCurrentMove))
     {
     case EFFECT_MISTY_TERRAIN:
-        statusFlag = STATUS_FIELD_MISTY_TERRAIN;
-        gBattleCommunication[MULTISTRING_CHOOSER] = B_MSG_TERRAIN_SET_MISTY;
+        if (!(gFieldStatuses & STATUS_FIELD_MISTY_TERRAIN))
+        {
+            statusFlag = STATUS_FIELD_MISTY_TERRAIN;
+            gBattleCommunication[MULTISTRING_CHOOSER] = B_MSG_TERRAIN_SET_MISTY;
+        }
         break;
     case EFFECT_GRASSY_TERRAIN:
-        statusFlag = STATUS_FIELD_GRASSY_TERRAIN;
-        gBattleCommunication[MULTISTRING_CHOOSER] = B_MSG_TERRAIN_SET_GRASSY;
+        if (!(gFieldStatuses & STATUS_FIELD_GRASSY_TERRAIN))
+        {
+            statusFlag = STATUS_FIELD_GRASSY_TERRAIN;
+            gBattleCommunication[MULTISTRING_CHOOSER] = B_MSG_TERRAIN_SET_GRASSY;
+        }
         break;
     case EFFECT_ELECTRIC_TERRAIN:
-        statusFlag = STATUS_FIELD_ELECTRIC_TERRAIN;
-        gBattleCommunication[MULTISTRING_CHOOSER] = B_MSG_TERRAIN_SET_ELECTRIC;
+        if (!(gFieldStatuses & STATUS_FIELD_ELECTRIC_TERRAIN))
+        {
+            statusFlag = STATUS_FIELD_ELECTRIC_TERRAIN;
+            gBattleCommunication[MULTISTRING_CHOOSER] = B_MSG_TERRAIN_SET_ELECTRIC;
+        }
         break;
     case EFFECT_PSYCHIC_TERRAIN:
-        statusFlag = STATUS_FIELD_PSYCHIC_TERRAIN;
-        gBattleCommunication[MULTISTRING_CHOOSER] = B_MSG_TERRAIN_SET_PSYCHIC;
+        if (!(gFieldStatuses & STATUS_FIELD_PSYCHIC_TERRAIN))
+        {
+            statusFlag = STATUS_FIELD_PSYCHIC_TERRAIN;
+            gBattleCommunication[MULTISTRING_CHOOSER] = B_MSG_TERRAIN_SET_PSYCHIC;
+        }
         break;
     case EFFECT_HIT_SET_TERRAIN:
-        statusFlag = GetMoveTerrainFlag(gCurrentMove);
-        gBattleCommunication[MULTISTRING_CHOOSER] = B_MSG_TERRAIN_SET_PSYCHIC;
+        if (!(gFieldStatuses & GetMoveTerrainFlag(gCurrentMove)))
+        {
+            statusFlag = GetMoveTerrainFlag(gCurrentMove);
+            gBattleCommunication[MULTISTRING_CHOOSER] = B_MSG_TERRAIN_SET_PSYCHIC;
+        }
         break;
     default:
         break;
     }
-    enum ItemHoldEffect atkHoldEffect = GetBattlerHoldEffect(gBattlerAttacker, TRUE);
-
-    gFieldStatuses &= ~STATUS_FIELD_TERRAIN_ANY;
-    gFieldStatuses |= statusFlag;
-    gFieldTimers.terrainTimer = gBattleTurnCounter + (atkHoldEffect == HOLD_EFFECT_TERRAIN_EXTENDER) ? 8 : 5;
-    gBattlescriptCurrInstr = cmd->nextInstr;
+    if (statusFlag)
+    {
+        enum ItemHoldEffect atkHoldEffect = GetBattlerHoldEffect(gBattlerAttacker, TRUE);
+        gFieldStatuses &= ~STATUS_FIELD_TERRAIN_ANY;
+        gFieldStatuses |= statusFlag;
+        gFieldTimers.terrainTimer = gBattleTurnCounter + (atkHoldEffect == HOLD_EFFECT_TERRAIN_EXTENDER) ? 8 : 5;
+        gBattlescriptCurrInstr = cmd->nextInstr;
+    }
+    else
+    {
+        gBattlescriptCurrInstr = cmd->jumpInstr;
+    }
 }
 
 void BS_JumpIfTerrainAffected(void)
diff --git a/test/battle/move_effect/misty_terrain.c b/test/battle/move_effect/misty_terrain.c
index b96f0c650d..cd9a92eb37 100644
--- a/test/battle/move_effect/misty_terrain.c
+++ b/test/battle/move_effect/misty_terrain.c
@@ -87,3 +87,16 @@ SINGLE_BATTLE_TEST("Misty Terrain lasts for 5 turns")
         MESSAGE("The mist disappeared from the battlefield.");
     }
 }
+
+SINGLE_BATTLE_TEST("Misty Terrain will fail if there is one already on the field")
+{
+    GIVEN {
+        PLAYER(SPECIES_WOBBUFFET);
+        OPPONENT(SPECIES_WOBBUFFET);
+    } WHEN {
+        TURN { MOVE(player, MOVE_MISTY_TERRAIN); MOVE(opponent, MOVE_MISTY_TERRAIN); }
+    } SCENE {
+        ANIMATION(ANIM_TYPE_MOVE, MOVE_MISTY_TERRAIN, player);
+        NOT ANIMATION(ANIM_TYPE_MOVE, MOVE_MISTY_TERRAIN, opponent);
+    }
+}