diff --git a/lib/unix.c b/lib/unix.c
index 44389d2..8bacb3e 100644
--- a/lib/unix.c
+++ b/lib/unix.c
@@ -20,6 +20,10 @@
  */
 #include "os_base.h"
 
+#ifdef QB_SOLARIS
+#include <signal.h>
+#endif
+
 #ifdef HAVE_SYS_SHM_H
 #include <sys/shm.h>
 #endif