diff --git a/configure.ac b/configure.ac
index 5faf172..74b4554 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,9 @@
 # $Id$
 AC_CONFIG_MACRO_DIR([m4])
 
+# prevent HAVE_QTxxx does not appear in AM_CONDITIONAL
+m4_include(m4/ax_check_qt.m4)
+
 m4_define(x_package_name, libpcscxx)
 m4_define(x_major, 3)
 m4_define(x_minor, 1)
diff --git a/m4/ax_check_qt.m4 b/m4/ax_check_qt.m4
index e503a9c..19383c6 100644
--- a/m4/ax_check_qt.m4
+++ b/m4/ax_check_qt.m4
@@ -73,7 +73,7 @@ AC_DEFUN([AX_CXX_CHECK_QT], [
       AM_CPPFLAGS+=" ${$1_CFLAGS}"
       AM_CXXFLAGS+=" ${$1_CFLAGS}"
       LIBS+=" ${$1_LIBS}"
-    ], [HAVE_$1=0])
+    ])
   ])
   AM_CONDITIONAL(HAVE_$1, test $HAVE_$1 -eq 1)
   AC_SUBST(AM_CPPFLAGS)