diff --git a/osdep.h b/osdep.h
index f818ce03a8..29a261cbd5 100644
--- a/osdep.h
+++ b/osdep.h
@@ -27,6 +27,8 @@ extern void __longjmp(jmp_buf env, int val);
 
 #include <signal.h>
 
+struct siginfo;
+
 /* NOTE: it works only because the glibc sigset_t is >= kernel sigset_t */
 struct qemu_sigaction {
     union {