diff --git a/include/util.h b/include/util.h
index bda941ce..9277fa6e 100644
--- a/include/util.h
+++ b/include/util.h
@@ -2,6 +2,7 @@
 #define _SWAY_UTIL_H
 
 #include <stdint.h>
+#include <stdbool.h>
 #include <unistd.h>
 #include <sys/types.h> 
 #include <xkbcommon/xkbcommon.h>