diff --git a/src/librc/librc-daemon.c b/src/librc/librc-daemon.c
index 0a0fbb8f..b89f68ae 100644
--- a/src/librc/librc-daemon.c
+++ b/src/librc/librc-daemon.c
@@ -15,6 +15,8 @@
  *    except according to the terms contained in the LICENSE file.
  */
 
+#include <signal.h>
+
 #include "queue.h"
 #include "librc.h"