diff --git a/soes/esc_coe.c b/soes/esc_coe.c
index 352c49d..9f53a41 100644
--- a/soes/esc_coe.c
+++ b/soes/esc_coe.c
@@ -12,6 +12,7 @@
 
 #include <stdlib.h>
 #include <stddef.h>
+#include <stdbool.h>
 #include <string.h>
 #include <cc.h>
 #include "esc.h"