diff --git a/src/Layout.c b/src/Layout.c
index 9334a470..bb4b282d 100644
--- a/src/Layout.c
+++ b/src/Layout.c
@@ -2,8 +2,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <math.h>
-
-typedef unsigned char bool;
+#include <stdbool.h>
 
 #define CSS_UNDEFINED NAN