diff --git a/include/i3.h b/include/i3.h
index 41ccbf6b..31da700a 100644
--- a/include/i3.h
+++ b/include/i3.h
@@ -18,7 +18,7 @@
 #ifndef _I3_H
 #define _I3_H
 
-#define NUM_ATOMS 9
+#define NUM_ATOMS 10
 
 extern char *application_path;
 extern Display *xkbdpy;