diff --git a/src/main/java/gregtech/api/world/GT_Worldgen.java b/src/main/java/gregtech/api/world/GT_Worldgen.java
index 5863aa76..359fdb0e 100644
--- a/src/main/java/gregtech/api/world/GT_Worldgen.java
+++ b/src/main/java/gregtech/api/world/GT_Worldgen.java
@@ -68,7 +68,7 @@ public abstract class GT_Worldgen {
             return tValue;
         }
         return tAllowed;*/
-        return aDimensionType == 0 || aDimensionType == -1 || aDimensionType == 1 || aDimensionType == exceptedDimension;
+        return aDimensionType == exceptedDimension;
     }
 
     public boolean isGenerationAllowed(World aWorld, BlockPos blockPos) {
diff --git a/src/main/java/gregtech/loaders/postload/GT_Worldgenloader.java b/src/main/java/gregtech/loaders/postload/GT_Worldgenloader.java
index 7d85db57..c8956407 100644
--- a/src/main/java/gregtech/loaders/postload/GT_Worldgenloader.java
+++ b/src/main/java/gregtech/loaders/postload/GT_Worldgenloader.java
@@ -49,16 +49,16 @@ public class GT_Worldgenloader
         new GT_Worldgen_Stone("overworld.stone.basalt.large", true, GregTech_API.sBlockStones, 8, 0, 1, 300, 192, 0, 120, null, false);
         new GT_Worldgen_Stone("overworld.stone.basalt.huge", true, GregTech_API.sBlockStones, 8, 0, 1, 400, 240, 0, 120, null, false);
 
-        new GT_Worldgen_Stone("nether.stone.marble.tiny", false, GregTech_API.sBlockStones, 0, 0, 1, 50, 48, 0, 120, null, false);
-        new GT_Worldgen_Stone("nether.stone.marble.small", false, GregTech_API.sBlockStones, 0, 0, 1, 100, 96, 0, 120, null, false);
-        new GT_Worldgen_Stone("nether.stone.marble.medium", false, GregTech_API.sBlockStones, 0, 0, 1, 200, 144, 0, 120, null, false);
-        new GT_Worldgen_Stone("nether.stone.marble.large", false, GregTech_API.sBlockStones, 0, 0, 1, 300, 192, 0, 120, null, false);
-        new GT_Worldgen_Stone("nether.stone.marble.huge", false, GregTech_API.sBlockStones, 0, 0, 1, 400, 240, 0, 120, null, false);
-        new GT_Worldgen_Stone("nether.stone.basalt.tiny", false, GregTech_API.sBlockStones, 8, 0, 1, 50, 48, 0, 120, null, false);
-        new GT_Worldgen_Stone("nether.stone.basalt.small", false, GregTech_API.sBlockStones, 8, 0, 1, 100, 96, 0, 120, null, false);
-        new GT_Worldgen_Stone("nether.stone.basalt.medium", false, GregTech_API.sBlockStones, 8, 0, 1, 200, 144, 0, 120, null, false);
-        new GT_Worldgen_Stone("nether.stone.basalt.large", false, GregTech_API.sBlockStones, 8, 0, 1, 300, 192, 0, 120, null, false);
-        new GT_Worldgen_Stone("nether.stone.basalt.huge", false, GregTech_API.sBlockStones, 8, 0, 1, 400, 240, 0, 120, null, false);
+        new GT_Worldgen_Stone("nether.stone.marble.tiny", false, GregTech_API.sBlockStones, 0, -1, 1, 50, 48, 0, 120, null, false);
+        new GT_Worldgen_Stone("nether.stone.marble.small", false, GregTech_API.sBlockStones, 0, -1, 1, 100, 96, 0, 120, null, false);
+        new GT_Worldgen_Stone("nether.stone.marble.medium", false, GregTech_API.sBlockStones, 0, -1, 1, 200, 144, 0, 120, null, false);
+        new GT_Worldgen_Stone("nether.stone.marble.large", false, GregTech_API.sBlockStones, 0, -1, 1, 300, 192, 0, 120, null, false);
+        new GT_Worldgen_Stone("nether.stone.marble.huge", false, GregTech_API.sBlockStones, 0, -1, 1, 400, 240, 0, 120, null, false);
+        new GT_Worldgen_Stone("nether.stone.basalt.tiny", false, GregTech_API.sBlockStones, 8, -1, 1, 50, 48, 0, 120, null, false);
+        new GT_Worldgen_Stone("nether.stone.basalt.small", false, GregTech_API.sBlockStones, 8, -1, 1, 100, 96, 0, 120, null, false);
+        new GT_Worldgen_Stone("nether.stone.basalt.medium", false, GregTech_API.sBlockStones, 8, -1, 1, 200, 144, 0, 120, null, false);
+        new GT_Worldgen_Stone("nether.stone.basalt.large", false, GregTech_API.sBlockStones, 8, -1, 1, 300, 192, 0, 120, null, false);
+        new GT_Worldgen_Stone("nether.stone.basalt.huge", false, GregTech_API.sBlockStones, 8, -1, 1, 400, 240, 0, 120, null, false);
 
         new GT_Worldgen_GT_Ore_SmallPieces("ore.small.copper", true, 60, 120, 32, !tPFAA, true, true, true, true, false, Materials.Copper);
         new GT_Worldgen_GT_Ore_SmallPieces("ore.small.tin", true, 60, 120, 32, !tPFAA, true, true, true, true, true, Materials.Tin);