diff --git a/src/main/java/codechicken/nei/WorldOverlayRenderer.java b/src/main/java/codechicken/nei/WorldOverlayRenderer.java
index 969e3c8b..40700eac 100644
--- a/src/main/java/codechicken/nei/WorldOverlayRenderer.java
+++ b/src/main/java/codechicken/nei/WorldOverlayRenderer.java
@@ -24,10 +24,13 @@ public class WorldOverlayRenderer implements IKeyStateTracker {
     public static int mobOverlay = 0;
     private static byte[] mobSpawnCache;
     private static long mobOverlayUpdateTime;
+    private static String oregenPatternName;
+    private static boolean hasOregenPatternBeenSet = false;
 
     public static void reset() {
         mobOverlay = 0;
         chunkOverlay = 0;
+        hasOregenPatternBeenSet = false;
     }
 
     @Override
@@ -279,15 +282,33 @@ public class WorldOverlayRenderer implements IKeyStateTracker {
                         GL11.glVertex3d(x2, y2, z1 + h);
                     }
                 } else if (chunkOverlay == 3) {
-                    int gx1 = (((entity.chunkCoordX < 0 ? entity.chunkCoordX - 3 : entity.chunkCoordX) / 3 * 3) << 4)
-                            - intOffsetX;
-                    int gz1 = (((entity.chunkCoordZ < 0 ? entity.chunkCoordZ - 3 : entity.chunkCoordZ) / 3 * 3) << 4)
-                            - intOffsetZ;
-                    if (entity.chunkCoordX < 0) {
-                        gx1 += 16;
+                    if (!hasOregenPatternBeenSet) {
+                        try {
+                            oregenPatternName = ((Enum<?>) Class.forName("gregtech.common.GT_Worldgenerator")
+                                    .getDeclaredField("oregenPattern").get(null)).name();
+                        } catch (Exception ignored) {
+                            oregenPatternName = "AXISSYMMETRICAL";
+                        }
+                        hasOregenPatternBeenSet = true;
                     }
-                    if (entity.chunkCoordZ < 0) {
-                        gz1 += 16;
+                    int gx1;
+                    int gz1;
+                    if (oregenPatternName.equals("EQUAL_SPACING")) {
+                        // gt oregen uses new regular pattern
+                        gx1 = ((Math.floorDiv(entity.chunkCoordX, 3) * 3) << 4) - intOffsetX;
+                        gz1 = ((Math.floorDiv(entity.chunkCoordZ, 3) * 3) << 4) - intOffsetZ;
+                    } else {
+                        // gt oregen uses old bugged pattern
+                        gx1 = (((entity.chunkCoordX < 0 ? entity.chunkCoordX - 3 : entity.chunkCoordX) / 3 * 3) << 4)
+                                - intOffsetX;
+                        gz1 = (((entity.chunkCoordZ < 0 ? entity.chunkCoordZ - 3 : entity.chunkCoordZ) / 3 * 3) << 4)
+                                - intOffsetZ;
+                        if (entity.chunkCoordX < 0) {
+                            gx1 += 16;
+                        }
+                        if (entity.chunkCoordZ < 0) {
+                            gz1 += 16;
+                        }
                     }
                     int gx2 = gx1 + 48;
                     int gz2 = gz1 + 48;