diff --git a/google-maps-static.el b/google-maps-static.el
index 644408d..98d9ac8 100644
--- a/google-maps-static.el
+++ b/google-maps-static.el
@@ -332,7 +332,7 @@ PLIST can contains this properties:
   "Zoom a Google map in."
   (interactive)
   (unless (plist-member google-maps-static-params :zoom)
-    (error "Current zoom level is unknown, cannot zoom in."))
+    (plist-set google-maps-static-params :zoom google-maps-static-default-zoom))
   (google-maps-static-zoom (1+ (plist-get google-maps-static-params :zoom))))
 
 (defun google-maps-static-zoom-out ()