diff --git a/src/platform/tests/Makefile.am b/src/platform/tests/Makefile.am
index 017aad430b..6162b2e9d8 100644
--- a/src/platform/tests/Makefile.am
+++ b/src/platform/tests/Makefile.am
@@ -6,6 +6,7 @@ AM_CPPFLAGS = \
 	-I${top_builddir}/src \
 	-I${top_srcdir}/src/logging \
 	-I${top_srcdir}/libnm-util \
+	-I${top_builddir}/libnm-util \
 	-I${srcdir}/.. \
 	$(GLIB_CFLAGS) \
 	$(GUDEV_CFLAGS) \