diff --git a/worldedit-bukkit/src/main/resources/worldedit-adapters.jar b/worldedit-bukkit/src/main/resources/worldedit-adapters.jar
index f0e538579..c1a850965 100644
Binary files a/worldedit-bukkit/src/main/resources/worldedit-adapters.jar and b/worldedit-bukkit/src/main/resources/worldedit-adapters.jar differ
diff --git a/worldedit-core/src/main/java/com/fastasyncworldedit/core/extent/processor/HeightmapProcessor.java b/worldedit-core/src/main/java/com/fastasyncworldedit/core/extent/processor/HeightmapProcessor.java
index 5ac86684e..28bc3e6d8 100644
--- a/worldedit-core/src/main/java/com/fastasyncworldedit/core/extent/processor/HeightmapProcessor.java
+++ b/worldedit-core/src/main/java/com/fastasyncworldedit/core/extent/processor/HeightmapProcessor.java
@@ -72,7 +72,7 @@ public class HeightmapProcessor implements IBatchProcessor {
                         int index = (z << 4) | x;
                         if (!updated[i].get(index) // ignore if that position was already set
                                 && type.includes(block)) {
-                            heightmaps[i][index] = y + 1; // mc requires + 1
+                            heightmaps[i][index] = y + 1 - minY; // mc requires + 1, heightmaps are normalized internally
                             updated[i].set(index); // mark as updated
                         }
                     }