diff --git a/servers/slurpd/fm.c b/servers/slurpd/fm.c
index 2547d96408..164f407283 100644
--- a/servers/slurpd/fm.c
+++ b/servers/slurpd/fm.c
@@ -27,6 +27,7 @@
 #include <ac/string.h>
 #include <ac/signal.h>
 #include <ac/socket.h>
+#include <ac/unistd.h>
 
 #include "slurp.h"
 #include "globals.h"