diff --git a/system-settings/plugins/keyfile/io/writer.h b/system-settings/plugins/keyfile/io/writer.h
index 5cd7e68b98..fa04deef98 100644
--- a/system-settings/plugins/keyfile/io/writer.h
+++ b/system-settings/plugins/keyfile/io/writer.h
@@ -22,6 +22,7 @@
 #ifndef _KEYFILE_PLUGIN_WRITER_H
 #define _KEYFILE_PLUGIN_WRITER_H
 
+#include <sys/types.h>
 #include <glib.h>
 #include <nm-connection.h>