diff --git a/orte/mca/notifier/command/notifier_command_child.c b/orte/mca/notifier/command/notifier_command_child.c
index 523caf22d8..c4b8239a39 100644
--- a/orte/mca/notifier/command/notifier_command_child.c
+++ b/orte/mca/notifier/command/notifier_command_child.c
@@ -38,6 +38,7 @@
 #include <sys/wait.h>
 #endif
 #include <ctype.h>
+#include <signal.h>
 
 #include "opal/util/argv.h"