diff --git a/dap-utils.el b/dap-utils.el
index fe5c23c1..8c2ebda8 100644
--- a/dap-utils.el
+++ b/dap-utils.el
@@ -61,7 +61,7 @@
   :type 'string)
 
 (defcustom dap-utils-openvsx-extension-api-url
-  "https://open-vsx.org/api/%s/%s/%s/"
+  "https://open-vsx.org/api/%s/%s/%s"
   "Open VSX extension api url."
   :group 'dap-utils
   :type 'string)