diff --git a/src/net/torvald/terrarum/modulebasegame/gameitems/FixtureItemBase.kt b/src/net/torvald/terrarum/modulebasegame/gameitems/FixtureItemBase.kt
index baeef4455..644c76fb2 100644
--- a/src/net/torvald/terrarum/modulebasegame/gameitems/FixtureItemBase.kt
+++ b/src/net/torvald/terrarum/modulebasegame/gameitems/FixtureItemBase.kt
@@ -59,12 +59,13 @@ open class FixtureItemBase(originalID: ItemID, val fixtureClassName: String) : G
 
     override fun effectWhileEquipped(actor: ActorWithBody, delta: Float) {
 //        println("ghost: ${ghostItem}; ghostInit = $ghostInit; instance: $hash")
-        if (!ghostInit.get()) {
-            ghostItem.getAndSet(makeFixture())
-            ghostInit.getAndSet(true)
+        if (!ghostInit.compareAndExchangeAcquire(false, true)) {
+            ghostItem.set(makeFixture())
 //            printdbg(this, "ghost item initialised: $ghostItem")
+
         }
 
+
         (INGAME as TerrarumIngame).blockMarkingActor.let {
             it.setGhost(ghostItem.get())
             it.isVisible = true