diff --git a/src/Makefile.am b/src/Makefile.am
index 05ecebe..0320070 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,6 +1,6 @@
 NULL = 
 
-INCLUDES =								\
+AM_CPPFLAGS =								\
 	-I$(top_srcdir)							\
 	-DG_LOG_DOMAIN=\"xfce4-taskmanager\"				\
 	-DPACKAGE_LOCALE_DIR=\"$(localedir)\"