diff --git a/configure.ac b/configure.ac
index 68ce36c..4e2a9fe 100644
--- a/configure.ac
+++ b/configure.ac
@@ -109,6 +109,7 @@ AC_MSG_RESULT([$debug])
 if test ! x$debug = xyes ; then
         AC_DEFINE([NDEBUG], [1], [No Debug])
 else
+        AC_DEFINE([KMSCON_ENABLE_DEBUG], [1], [Enable debug for kmscon])
         AC_DEFINE([LOG_ENABLE_DEBUG], [1], [Enable debug for log subsystem])
 fi