diff --git a/MCGalaxy/Levels/Level.Blocks.cs b/MCGalaxy/Levels/Level.Blocks.cs
index 763080226..3f78af2e5 100644
--- a/MCGalaxy/Levels/Level.Blocks.cs
+++ b/MCGalaxy/Levels/Level.Blocks.cs
@@ -461,7 +461,7 @@ namespace MCGalaxy {
         
         public bool LightPasses(ExtBlock block) {
             BlockDefinition def = GetBlockDef(block);
-            if (def != null) return !def.BlocksLight || def.BlockDraw != DrawType.Opaque || def.MinZ > 0;
+            if (def != null) return !def.BlocksLight || def.BlockDraw == DrawType.TransparentThick || def.MinZ > 0;
             return Block.LightPass(block.BlockID);
         }
     }