diff --git a/Makefile.am b/Makefile.am
index 62244a8..e93a0f0 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,3 +1,5 @@
+AM_CPPFLAGS = -I$(top_srcdir)/include
+
 AUTOMAKE_OPTIONS=foreign subdir-objects
 
 SUBDIRS = include compat