diff --git a/ax_check_qt.m4 b/ax_check_qt.m4
index 4e5179e..91c0072 100644
--- a/ax_check_qt.m4
+++ b/ax_check_qt.m4
@@ -54,7 +54,7 @@ AC_DEFUN([AX_CXX_QT_TOOL], [
       elif which "$2" > /dev/null; then
         $1=$2
       elif which "$2-qt4" > /dev/null; then
-        $1=$2
+        $1=$2-qt4
       else
         HAVE_$1=0
         $1=""