diff --git a/worldedit-core/src/main/java/com/sk89q/worldedit/EditSession.java b/worldedit-core/src/main/java/com/sk89q/worldedit/EditSession.java
index a6397ffb49..3d2441a5d7 100644
--- a/worldedit-core/src/main/java/com/sk89q/worldedit/EditSession.java
+++ b/worldedit-core/src/main/java/com/sk89q/worldedit/EditSession.java
@@ -1002,10 +1002,17 @@ public int fillXZ(BlockVector3 origin, Pattern pattern, double radius, int depth
         checkArgument(radius >= 0, "radius >= 0");
         checkArgument(depth >= 1, "depth >= 1");
 
+        // Avoid int overflow (negative coordinate space allows for overflow back round to positive if the depth is large enough).
+        // Depth is always 1 or greater, thus the lower bound should always be <= origin y.
+        int lowerBound = origin.getBlockY() - depth + 1;
+        if (lowerBound > origin.getBlockY()) {
+            lowerBound = Integer.MIN_VALUE;
+        }
+
         MaskIntersection mask = new MaskIntersection(
                 new RegionMask(new EllipsoidRegion(null, origin, Vector3.at(radius, radius, radius))),
                 new BoundedHeightMask(
-                        Math.max(origin.getBlockY() - depth + 1, getWorld().getMinY()),
+                        Math.max(lowerBound, getWorld().getMinY()),
                         Math.min(getWorld().getMaxY(), origin.getBlockY())),
                 Masks.negate(new ExistingBlockMask(this)));