diff --git a/opal/mca/timer/aix/timer_aix_component.c b/opal/mca/timer/aix/timer_aix_component.c
index b7b247cf6a..d7d83e1f1b 100644
--- a/opal/mca/timer/aix/timer_aix_component.c
+++ b/opal/mca/timer/aix/timer_aix_component.c
@@ -18,6 +18,7 @@
 
 #include "opal_config.h"
 
+#include "opal/constants.h"
 #include "opal/mca/timer/timer.h"
 #include "opal/mca/timer/aix/timer_aix.h"