diff --git a/lib/clixon/clixon_sig.h b/lib/clixon/clixon_sig.h
index e9fac691..7abf203e 100644
--- a/lib/clixon/clixon_sig.h
+++ b/lib/clixon/clixon_sig.h
@@ -38,6 +38,8 @@
 #ifndef _CLIXON_SIG_H_
 #define _CLIXON_SIG_H_
 
+#include <signal.h>
+
 /*
  * Types
  */