diff --git a/src/main/java/dan200/computercraft/shared/turtle/core/TurtleBrain.java b/src/main/java/dan200/computercraft/shared/turtle/core/TurtleBrain.java
index 4813928ed..b5a8411a1 100644
--- a/src/main/java/dan200/computercraft/shared/turtle/core/TurtleBrain.java
+++ b/src/main/java/dan200/computercraft/shared/turtle/core/TurtleBrain.java
@@ -496,10 +496,11 @@ public class TurtleBrain implements ITurtleAccess
             return true;
         }
 
-        if ( !world.isBlockLoaded( pos ) )
-        {
-            return false;
-        }
+        // Ensure the chunk is loaded
+        if( !world.isBlockLoaded( pos ) ) return false;
+
+        // Ensure we're inside the world border
+        if( !world.getWorldBorder().contains( pos ) ) return false;
 
         oldOwner.notifyMoveStart();
 
diff --git a/src/main/java/dan200/computercraft/shared/turtle/core/TurtleMoveCommand.java b/src/main/java/dan200/computercraft/shared/turtle/core/TurtleMoveCommand.java
index cadc8b73e..80f8d0a24 100644
--- a/src/main/java/dan200/computercraft/shared/turtle/core/TurtleMoveCommand.java
+++ b/src/main/java/dan200/computercraft/shared/turtle/core/TurtleMoveCommand.java
@@ -14,9 +14,9 @@ import dan200.computercraft.api.turtle.TurtleCommandResult;
 import dan200.computercraft.shared.util.WorldUtil;
 import net.minecraft.block.Block;
 import net.minecraft.entity.Entity;
+import net.minecraft.util.EnumFacing;
 import net.minecraft.util.math.AxisAlignedBB;
 import net.minecraft.util.math.BlockPos;
-import net.minecraft.util.EnumFacing;
 import net.minecraft.world.World;
 
 import javax.annotation.Nonnull;
@@ -170,6 +170,10 @@ public class TurtleMoveCommand implements ITurtleCommand
         {
             return TurtleCommandResult.failure( "Cannot leave loaded world" );
         }
+        if( !world.getWorldBorder().contains( position ) )
+        {
+            return TurtleCommandResult.failure( "Cannot pass the world border" );
+        }
         return TurtleCommandResult.success();
     }
 }