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diff --git a/vm/llvm/inline_primitive.cpp b/vm/llvm/inline_primitive.cpp
index 3a6be9f..1deded8 100644
--- a/vm/llvm/inline_primitive.cpp
+++ b/vm/llvm/inline_primitive.cpp
@@ -101,8 +101,8 @@ namespace rubinius {
 
     Value* anded = BinaryOperator::CreateAnd(lint, rint, "fixnums_anded", ops.current_block());
 
-    Value* fix_mask = ConstantInt::get(Type::Int32Ty, TAG_FIXNUM_MASK);
-    Value* fix_tag  = ConstantInt::get(Type::Int32Ty, TAG_FIXNUM);
+    Value* fix_mask = ConstantInt::get(ops_.NativeIntTy, TAG_FIXNUM_MASK);
+    Value* fix_tag  = ConstantInt::get(ops_.NativeIntTy, TAG_FIXNUM);
 
     Value* masked = BinaryOperator::CreateAnd(anded, fix_mask, "masked", ops.current_block());
 
diff --git a/vm/llvm/jit_operations.hpp b/vm/llvm/jit_operations.hpp
index 8d61359..803d98f 100644
--- a/vm/llvm/jit_operations.hpp
+++ b/vm/llvm/jit_operations.hpp
@@ -1,6 +1,7 @@
 #ifndef RBX_LLVM_JIT_OPERATIONS
 #define RBX_LLVM_JIT_OPERATIONS
 
+#include "config.h"
 #include "builtin/class.hpp"
 #include "builtin/fixnum.hpp"
 #include "builtin/symbol.hpp"
@@ -51,7 +52,6 @@ namespace rubinius {
     const llvm::Type* IntPtrTy;
     const llvm::Type* ObjType;
     const llvm::Type* ObjArrayTy;
-    const llvm::Type* Int31Ty;
 
     // Frequently used types
     const llvm::Type* VMTy;
@@ -77,7 +77,7 @@ namespace rubinius {
       zero_ = ConstantInt::get(Type::Int32Ty, 0);
       one_ =  ConstantInt::get(Type::Int32Ty, 1);
 
-#if __LP64__
+#if IS_X8664
       IntPtrTy = llvm::Type::Int64Ty;
       FixnumTy = llvm::IntegerType::get(63);
 #else
@@ -93,8 +93,6 @@ namespace rubinius {
       ObjType = ptr_type("Object");
       ObjArrayTy = PointerType::getUnqual(ObjType);
 
-      Int31Ty = llvm::IntegerType::get(31);
-
       VMTy = ptr_type("VM");
       CallFrameTy = ptr_type("CallFrame");
 
@@ -364,7 +362,7 @@ namespace rubinius {
     }
 
     Value* last_sp_as_int() {
-      return ConstantInt::get(Type::Int32Ty, last_sp_);
+      return ConstantInt::get(NativeIntTy, last_sp_);
     }
 
     void flush_stack() { }
@@ -490,19 +488,19 @@ namespace rubinius {
     //
     Value* cast_int(Value* obj) {
       return b().CreatePtrToInt(
-          obj, IntPtrTy, "cast");
+          obj, NativeIntTy, "cast");
     }
 
     // Fixnum manipulations
     //
     Value* tag_strip(Value* obj, const Type* type = NULL) {
-      if(!type) type = Int31Ty;
+      if(!type) type = FixnumTy;
 
       Value* i = b().CreatePtrToInt(
-          obj, Type::Int32Ty, "as_int");
+          obj, NativeIntTy, "as_int");
 
       Value* more = b().CreateLShr(
-          i, ConstantInt::get(Type::Int32Ty, 1),
+          i, ConstantInt::get(NativeIntTy, 1),
           "lshr");
       return b().CreateIntCast(
           more, type, true, "stripped");