diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/regions/Region.java b/worldedit-core/src/main/java/com/sk89q/worldedit/regions/Region.java
index c236992cf8..816902f8ff 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/regions/Region.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/regions/Region.java
@@ -403,7 +403,9 @@ default IChunkSet processSet(IChunk chunk, IChunkGet get, IChunkSet set) {
         if (tx >= min.x() && bx <= max.x() && tz >= min.z() && bz <= max.z()) {
             // contains some
             boolean processExtra = false;
-            for (int layer = getMinimumY() >> 4; layer <= getMaximumY() >> 4; layer++) {
+            final int minLayer = Math.max(getMinimumY(), chunk.getMinY()) >> 4;
+            final int maxLayer = Math.min(getMaximumY(), chunk.getMaxY()) >> 4;
+            for (int layer = minLayer; layer <= maxLayer; layer++) {
                 if (!set.hasSection(layer)) {
                     continue;
                 }
@@ -457,7 +459,9 @@ default IChunkSet processSet(IChunk chunk, IChunkGet get, IChunkSet set, boolean
         if (tx >= min.x() && bx <= max.x() && tz >= min.z() && bz <= max.z()) {
             // contains some
             boolean processExtra = false;
-            for (int layer = getMinimumY() >> 4; layer <= getMaximumY() >> 4; layer++) {
+            final int minLayer = Math.max(getMinimumY(), chunk.getMinY()) >> 4;
+            final int maxLayer = Math.min(getMaximumY(), chunk.getMaxY()) >> 4;
+            for (int layer = minLayer; layer <= maxLayer; layer++) {
                 int by = layer << 4;
                 int ty = by + 15;
                 if (containsEntireCuboid(bx, tx, by, ty, bz, tz)) {