diff --git a/src/svnqt/smart_pointer.hpp b/src/svnqt/smart_pointer.hpp
index f579160..4156e0a 100644
--- a/src/svnqt/smart_pointer.hpp
+++ b/src/svnqt/smart_pointer.hpp
@@ -20,7 +20,7 @@
 #ifndef _smart_pointer_hpp
 #define _smart_pointer_hpp
 
-#if defined  TQT_THREAD_SUPPORT
+#if defined  QT_THREAD_SUPPORT
 #include "tqmutex.h"
 #endif
 
@@ -41,27 +41,27 @@ class ref_count {
 protected:
     //! reference count member
     long m_RefCount;
-#ifdef TQT_THREAD_SUPPORT
+#ifdef QT_THREAD_SUPPORT
     TQMutex m_RefcountMutex;
 #endif
 public:
     //! first reference must be added after "new" via Pointer()
     ref_count() : m_RefCount(0)
-#ifdef TQT_THREAD_SUPPORT
+#ifdef QT_THREAD_SUPPORT
                   ,m_RefcountMutex()
 #endif
     {}
     virtual ~ref_count() {}
     //! add a reference
     void Incr() {
-#ifdef TQT_THREAD_SUPPORT
+#ifdef QT_THREAD_SUPPORT
         TQMutexLocker a(&m_RefcountMutex);
 #endif
         ++m_RefCount;
     }
     //! delete a reference
     bool Decr() {
-#ifdef TQT_THREAD_SUPPORT
+#ifdef QT_THREAD_SUPPORT
         TQMutexLocker a(&m_RefcountMutex);
 #endif
         --m_RefCount;