diff -r -U 3 minecraft_server\net\minecraft\world\gen\structure\StructureMineshaftPieces.java minecraft_server_patched\net\minecraft\world\gen\structure\StructureMineshaftPieces.java
--- minecraft_server\net\minecraft\world\gen\structure\StructureMineshaftPieces.java
+++ minecraft_server_patched\net\minecraft\world\gen\structure\StructureMineshaftPieces.java
@@ -547,7 +547,7 @@
          }
 
          int k;
-         for(lvt_5_1_ = 0; k < this.field_74887_e.func_78883_b(); k = k + 4) {
+         for(k = 0; k < this.field_74887_e.func_78883_b(); k = k + 4) {
             k = k + p_74861_3_.nextInt(this.field_74887_e.func_78883_b());
             if (k + 3 > this.field_74887_e.func_78883_b()) {
                break;