diff --git a/rigs/drake/drake.c b/rigs/drake/drake.c
index b4afb4d48..64737f938 100644
--- a/rigs/drake/drake.c
+++ b/rigs/drake/drake.c
@@ -23,6 +23,7 @@
 #include <stdlib.h>
 #include <string.h>  /* String function definitions */
 #include <unistd.h>  /* UNIX standard function definitions */
+#include <stdbool.h>
 
 #include "hamlib/rig.h"
 #include "serial.h"