diff --git a/tests/Makefile.am b/tests/Makefile.am
index 57358e93f1..c4d550fbf8 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -6,6 +6,7 @@
 SHELL = $(PREFERABLY_POSIX_SHELL)
 
 INCLUDES = \
+	-I$(top_builddir) -I$(top_srcdir) \
 	-I$(top_builddir)/gnulib/lib -I$(top_srcdir)/gnulib/lib \
 	-I$(top_builddir)/include -I$(top_srcdir)/include \
 	-I$(top_builddir)/src -I$(top_srcdir)/src \