1 files changed, 5 insertions, 5 deletions
diff --git a/clang/include/clang/Frontend/ASTUnit.h b/clang/include/clang/Frontend/ASTUnit.h
index dca71cffeca..70a1b2bb162 100644
--- a/clang/include/clang/Frontend/ASTUnit.h
+++ b/clang/include/clang/Frontend/ASTUnit.h
@@ -89,7 +89,7 @@ class ASTUnit {
   /// destroyed.
   llvm::SmallVector<llvm::sys::Path, 4> TemporaryFiles;
 
-#ifndef NDEBUG
+#ifdef _DEBUG
   /// \brief Simple hack to allow us to assert that ASTUnit is not being
   /// used concurrently, which is not supported.
   ///
@@ -106,24 +106,24 @@ class ASTUnit {
   
 public:
   class ConcurrencyCheck {
-#ifndef NDEBUG
+#ifdef _DEBUG
     volatile ASTUnit &Self;
 #endif
     
   public:
     explicit ConcurrencyCheck(ASTUnit &Self)
-#ifndef NDEBUG
+#ifdef _DEBUG
       : Self(Self) 
 #endif
     { 
-#ifndef NDEBUG
+#ifdef _DEBUG
       assert(Self.ConcurrencyCheckValue == CheckUnlocked && 
              "Concurrent access to ASTUnit!");
       Self.ConcurrencyCheckValue = CheckLocked;
 #endif
     }
     
-#ifndef NDEBUG
+#ifdef _DEBUG
     ~ConcurrencyCheck() {
       Self.ConcurrencyCheckValue = CheckUnlocked;
     }