diff --git a/common/net/minecraftforge/fluids/BlockFluidBase.java b/common/net/minecraftforge/fluids/BlockFluidBase.java
index 91716d0c4..9cb87bf47 100644
--- a/common/net/minecraftforge/fluids/BlockFluidBase.java
+++ b/common/net/minecraftforge/fluids/BlockFluidBase.java
@@ -58,6 +58,7 @@ public abstract class BlockFluidBase extends Block implements IFluidBlock
         this.temperature = fluid.temperature;
         this.maxScaledLight = fluid.luminosity;
         this.tickRate = fluid.viscosity / 200;
+        this.densityDir = fluid.density > 0 ? -1 : 1;
         fluid.setBlockID(id);
 
         displacementIds.putAll(defaultDisplacementIds);