diff --git a/acinclude.m4.in b/acinclude.m4.in
index 6a34780..45d4a22 100644
--- a/acinclude.m4.in
+++ b/acinclude.m4.in
@@ -1089,9 +1089,7 @@ AC_DEFUN([KDE_USE_TQT],
   ac_cxxflags_safe="$CXXFLAGS"
   CXXFLAGS="$CXXFLAGS -I/usr/include/tqt"
   AC_TRY_COMPILE([
-  #define TQT_VERSION_ONLY
   #include <tqt.h>
-  #undef TQT_VERSION_ONLY
   ], ,
     kde_tqtver=3,
   )