diff --git a/addons/chan_ooh323.h b/addons/chan_ooh323.h
index 79d0e248ee..1a4d55edb6 100644
--- a/addons/chan_ooh323.h
+++ b/addons/chan_ooh323.h
@@ -37,6 +37,7 @@
 #include <netdb.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <signal.h>
 #include <sys/signal.h>
 
 #include <asterisk/lock.h>