diff --git a/src/sm.c b/src/sm.c
index d97fe53e..47214d8b 100644
--- a/src/sm.c
+++ b/src/sm.c
@@ -34,6 +34,7 @@
 #include "sig.h"
 #include "tty.h"
 #include "sm.h"
+#include "utmp-api.h"
 
 sm_t sm;