diff --git a/libtransmission/torrent.c b/libtransmission/torrent.c
index 307032d9b..d88f4b710 100644
--- a/libtransmission/torrent.c
+++ b/libtransmission/torrent.c
@@ -10,6 +10,7 @@
  * $Id$
  */
 
+#include <signal.h> /* signal() */
 #include <sys/types.h> /* stat */
 #include <sys/stat.h> /* stat */
 #ifndef WIN32