diff --git a/lib/Makefile.am b/lib/Makefile.am
index 8435b52..170f4bf 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -4,7 +4,7 @@ AM_CPPFLAGS = \
 	-DPACKAGE_LOCALE_DIR=\""$(localedir)"\" \
 	-DPACKAGE_SRC_DIR=\""$(srcdir)"\" \
 	-DPACKAGE_DATA_DIR=\""$(pkgdatadir)"\" \
-	$(LIBTDATA_CFLAGS) -I$(srcdir)/include
+	$(LIBTDATA_CFLAGS) -I$(top_srcdir)/include
 
 AM_CFLAGS =\
 	 -Wall\