diff --git a/src/main/scala/li/cil/oc/common/item/Wrench.scala b/src/main/scala/li/cil/oc/common/item/Wrench.scala
index 193921b79..c2610daf4 100644
--- a/src/main/scala/li/cil/oc/common/item/Wrench.scala
+++ b/src/main/scala/li/cil/oc/common/item/Wrench.scala
@@ -27,6 +27,7 @@ import net.minecraftforge.common.util.ForgeDirection
 ))
 class Wrench extends traits.SimpleItem with api.internal.Wrench {
   setHarvestLevel("wrench", 1)
+  setMaxStackSize(1)
 
   override def doesSneakBypassUse(world: World, x: Int, y: Int, z: Int, player: EntityPlayer): Boolean = true