diff --git a/src/conky.c b/src/conky.c
index 5848b61..69a3d45 100644
--- a/src/conky.c
+++ b/src/conky.c
@@ -34,6 +34,7 @@
 #include "common.h"
 #include "timed_thread.h"
 #include <stdarg.h>
+#include <stdbool.h>
 #include <math.h>
 #include <time.h>
 #include <locale.h>