diff --git a/binaries/Makefile.am b/binaries/Makefile.am
index 9fd565e..a919d59 100644
--- a/binaries/Makefile.am
+++ b/binaries/Makefile.am
@@ -10,8 +10,13 @@ include $(top_srcdir)/test_apps/Makefile.am
 include $(top_srcdir)/src/Makefile.am
 
 LDADD = libsmpp34.la
-AM_CPPFLAGS = -D_REENTRANT -DBSD_COMP -D_POSIX_PTHREAD_SEMANTICS
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src \
+	-I$(top_srcdir) \
+	-D_REENTRANT \
+	-DBSD_COMP \
+	-D_POSIX_PTHREAD_SEMANTICS \
+	$(NULL)
 AM_CFLAGS = @CFLAGS@ -Wall -fPIC # -static
-INCLUDES = -I$(top_srcdir)/src -I$(top_srcdir)
 AM_LDFLAGS = -lrt -lpthread
 OBJ_EXTRA_DIST = $(esme_EXTRA_DIST)