diff --git a/src/gallium/auxiliary/os/os_thread.h b/src/gallium/auxiliary/os/os_thread.h
index 3e1c273027b..3773be945dd 100644
--- a/src/gallium/auxiliary/os/os_thread.h
+++ b/src/gallium/auxiliary/os/os_thread.h
@@ -44,6 +44,7 @@
 
 #include <pthread.h> /* POSIX threads headers */
 #include <stdio.h> /* for perror() */
+#include <signal.h>
 
 
 /* pipe_thread