diff --git a/unlock_indicator.c b/unlock_indicator.c
index a7e9b67..5babfba 100644
--- a/unlock_indicator.c
+++ b/unlock_indicator.c
@@ -869,7 +869,7 @@ void render_lock(uint32_t *resolution, xcb_drawable_t drawable) {
           scaling_factor, button_diameter_physical);
 
     // variable mapping for evaluating the clock position expression
-    const unsigned int vars_size = 11;
+    const unsigned int vars_size = 14;
     te_variable vars[] =
         {{"w", &width},
          {"h", &height},