diff --git a/addons/chan_ooh323.h b/addons/chan_ooh323.h
index 79d0e248eea11cd7222c6a35f6545326176a85f2..1a4d55edb6c6c3bf6944da71fef2c1b39efde4d8 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>