diff --git a/src/draw.c b/src/draw.c
index c84add3..4ce7ad1 100644
--- a/src/draw.c
+++ b/src/draw.c
@@ -6,6 +6,7 @@
 #include "config.h"
 #include "draw.h"
 
+#include <ctype.h>
 #include <fcntl.h>
 #include <stdbool.h>
 #include <stdint.h>