diff --git a/testcode/lib/seek.c b/testcode/lib/seek.c
index f04e88b4e..a01e6e94f 100644
--- a/testcode/lib/seek.c
+++ b/testcode/lib/seek.c
@@ -5,7 +5,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>
-#include <fcntl.h>
+#include <unistd.h>
 
 int main(int argc, char **argv)
 {