diff --git a/Makefile.am b/Makefile.am
index 075638a9..444f6c7d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -9,6 +9,7 @@ AM_CPPFLAGS = \
 	-include $(top_builddir)/config.h \
 	-I$(top_srcdir) \
 	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/library/include \
 	-Wno-unused-result \
 	-DLOCALEDIR=\"$(localedir)\" \
 	@HARDEN_CFLAGS@