diff --git a/fuse/guestunmount.c b/fuse/guestunmount.c
index c7152d076..f3f002034 100644
--- a/fuse/guestunmount.c
+++ b/fuse/guestunmount.c
@@ -32,6 +32,7 @@
 #include <libintl.h>
 #include <poll.h>
 #include <limits.h>
+#include <signal.h>
 #include <sys/types.h>
 #include <sys/wait.h>