diff --git a/src/main/java/com/volmit/iris/engine/decorator/IrisSurfaceDecorator.java b/src/main/java/com/volmit/iris/engine/decorator/IrisSurfaceDecorator.java
index 1bec6e2f0..dcc102c94 100644
--- a/src/main/java/com/volmit/iris/engine/decorator/IrisSurfaceDecorator.java
+++ b/src/main/java/com/volmit/iris/engine/decorator/IrisSurfaceDecorator.java
@@ -77,7 +77,7 @@ public class IrisSurfaceDecorator extends IrisEngineDecorator {
                     ((Bisected) bd).setHalf(Bisected.Half.BOTTOM);
                 }
 
-                if(!B.isAir(data.get(x, height + 1, z))) {
+                if(B.isAir(data.get(x, height + 1, z))) {
                     data.set(x, height + 1, z, fixFaces(bd, x, height + 1, z));
                 }
             } else {