diff --git a/src/uncooloff.c b/src/uncooloff.c
index 2c48e8cd0..8441cf1bd 100644
--- a/src/uncooloff.c
+++ b/src/uncooloff.c
@@ -11,6 +11,7 @@
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdbool.h>
 #include <time.h>
 #include <unistd.h>
 #include <sys/ioctl.h>