diff --git a/pkgs/by-name/qt/qtwebapp/package.nix b/pkgs/by-name/qt/qtwebapp/package.nix
index c2f04ff5df82..52b17e7c0403 100644
--- a/pkgs/by-name/qt/qtwebapp/package.nix
+++ b/pkgs/by-name/qt/qtwebapp/package.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   __structuredAttrs = true;
 
-  sourceRoot = "source/QtWebApp";
+  sourceRoot = "${finalAttrs.src.name}/QtWebApp";
 
   postPatch = ''
     cat >>QtWebApp.pro <<EOF