diff --git a/document-portal/Makefile.am.inc b/document-portal/Makefile.am.inc
index 26c3b5e7..d4929685 100644
--- a/document-portal/Makefile.am.inc
+++ b/document-portal/Makefile.am.inc
@@ -31,4 +31,4 @@ xdg_document_portal_SOURCES = \
 	$(NULL)
 
 xdg_document_portal_LDADD = $(BASE_LIBS) $(FUSE_LIBS) libflatpak-common.la
-xdg_document_portal_CFLAGS = $(BASE_CFLAGS) $(OSTREE_CFLAGS) $(SOUP_CFLAGS) $(FUSE_CFLAGS) -I$(srcdir)/document-portal -I$(builddir)/document-portal
+xdg_document_portal_CFLAGS = $(BASE_CFLAGS) $(OSTREE_CFLAGS) $(SOUP_CFLAGS) $(FUSE_CFLAGS) -I$(srcdir)/document-portal -I$(builddir)/document-portal -I$(srcdir)/permission-store -I$(builddir)/permission-store