diff --git a/NCPCompat/src/main/java/fr/neatmonster/nocheatplus/utilities/BlockProperties.java b/NCPCompat/src/main/java/fr/neatmonster/nocheatplus/utilities/BlockProperties.java
index db10d02d..f24a3d71 100644
--- a/NCPCompat/src/main/java/fr/neatmonster/nocheatplus/utilities/BlockProperties.java
+++ b/NCPCompat/src/main/java/fr/neatmonster/nocheatplus/utilities/BlockProperties.java
@@ -439,7 +439,7 @@ public class BlockProperties {
 		for (final Material mat : new Material[] { Material.NETHER_BRICK_STAIRS, Material.COBBLESTONE_STAIRS, 
 				Material.SMOOTH_STAIRS, Material.BRICK_STAIRS, Material.SANDSTONE_STAIRS, Material.WOOD_STAIRS, 
 				Material.SPRUCE_WOOD_STAIRS, Material.BIRCH_WOOD_STAIRS, Material.JUNGLE_WOOD_STAIRS }) {
-			blockFlags[mat.getId()] |= F_STAIRS | F_HEIGHT100 | F_XZ100 | F_GROUND; // Set ground too, to be sure.
+			blockFlags[mat.getId()] |= F_STAIRS | F_HEIGHT100 | F_XZ100 | F_GROUND | F_GROUND_HEIGHT; // Set ground too, to be sure.
 		}
 		
 		// Rails