diff --git a/tests/test-checksum.c b/tests/test-checksum.c
index 25d3c37e..e7fd7be4 100644
--- a/tests/test-checksum.c
+++ b/tests/test-checksum.c
@@ -20,6 +20,7 @@
 
 #include "config.h"
 
+#include "libglnx.h"
 #include "libgsystem.h"
 #include <glib.h>
 #include <stdlib.h>