diff --git a/build.py b/build.py
index 492e313..9383b89 100644
--- a/build.py
+++ b/build.py
@@ -323,7 +323,7 @@ int main(int argc,char **argv)
         return 1;
     }
 
-#if !defined(QT_THREAD_SUPPORT)
+#if !defined(TQT_THREAD_SUPPORT)
     fprintf(fp,"-x TQt_THREAD_SUPPORT\\n");
 #endif
 
diff --git a/configure.py b/configure.py
index 7077f3d..cd9921e 100644
--- a/configure.py
+++ b/configure.py
@@ -712,7 +712,7 @@ int main(int argc,char **argv)
         return 1;
     }
 
-#if !defined(WITH_THREAD) || !defined(QT_THREAD_SUPPORT)
+#if !defined(WITH_THREAD) || !defined(TQT_THREAD_SUPPORT)
     fprintf(fp,"-x TQt_THREAD_SUPPORT\\n");
 #endif