diff --git a/pkgs/misc/vscode-extensions/vscode-utils.nix b/pkgs/misc/vscode-extensions/vscode-utils.nix
index df8f24fcce7..5d446b025d7 100644
--- a/pkgs/misc/vscode-extensions/vscode-utils.nix
+++ b/pkgs/misc/vscode-extensions/vscode-utils.nix
@@ -51,12 +51,15 @@ let
   buildVscodeMarketplaceExtension = a@{
     name ? "",
     src ? null,
+    vsix ? null,
     mktplcRef,
     ...
   }: assert "" == name; assert null == src;
-  buildVscodeExtension ((removeAttrs a [ "mktplcRef" ]) // {
+  buildVscodeExtension ((removeAttrs a [ "mktplcRef" "vsix" ]) // {
     name = "${mktplcRef.publisher}-${mktplcRef.name}-${mktplcRef.version}";
-    src = fetchVsixFromVscodeMarketplace mktplcRef;
+    src = if (vsix != null)
+      then vsix
+      else fetchVsixFromVscodeMarketplace mktplcRef;
     vscodeExtUniqueId = "${mktplcRef.publisher}.${mktplcRef.name}";
   });