diff --git a/pkgs/development/libraries/qt-5/5.15/srcs.nix b/pkgs/development/libraries/qt-5/5.15/srcs.nix
index 36cab60e97b4..4bc04dbefd01 100644
--- a/pkgs/development/libraries/qt-5/5.15/srcs.nix
+++ b/pkgs/development/libraries/qt-5/5.15/srcs.nix
@@ -22,6 +22,19 @@ let
 in
 lib.mapAttrs mk (lib.importJSON ./srcs-generated.json)
 // {
+  qt3d = {
+    inherit version;
+    src = fetchgit {
+      url = "https://invent.kde.org/qt/qt/qt3d.git";
+      rev = "c3c7e6ebc29cce466d954f72f340a257d76b5ec2";
+      sha256 = "sha256-KMWZ4N2OO7TBVpcgvQf/gweZRT62i9XABOnq0x94PY4=";
+      fetchLFS = false;
+      fetchSubmodules = true;
+      deepClone = false;
+      leaveDotGit = false;
+    };
+  };
+
   # qtwebkit does not have an official release tarball on the qt mirror and is
   # mostly maintained by the community.
   qtwebkit = rec {