diff --git a/pkgs/build-support/rust/test/import-cargo-lock/basic-dynamic/default.nix b/pkgs/build-support/rust/test/import-cargo-lock/basic-dynamic/default.nix
index eea2c3760599..105303201617 100644
--- a/pkgs/build-support/rust/test/import-cargo-lock/basic-dynamic/default.nix
+++ b/pkgs/build-support/rust/test/import-cargo-lock/basic-dynamic/default.nix
@@ -1,10 +1,19 @@
-{ rustPlatform }:
-
+{ lib, rustPlatform }:
+let
+  fs = lib.fileset;
+in
 rustPlatform.buildRustPackage {
   pname = "basic-dynamic";
   version = "0.1.0";
 
-  src = ./.;
+  src = fs.toSource {
+    root = ./.;
+    fileset = fs.unions [
+      ./Cargo.toml
+      ./Cargo.lock
+      ./src
+    ];
+  };
 
   cargoLock.lockFileContents = builtins.readFile ./Cargo.lock;
 
diff --git a/pkgs/build-support/rust/test/import-cargo-lock/basic/default.nix b/pkgs/build-support/rust/test/import-cargo-lock/basic/default.nix
index d595b58109ad..325380977b88 100644
--- a/pkgs/build-support/rust/test/import-cargo-lock/basic/default.nix
+++ b/pkgs/build-support/rust/test/import-cargo-lock/basic/default.nix
@@ -1,10 +1,19 @@
-{ rustPlatform }:
-
+{ lib, rustPlatform }:
+let
+  fs = lib.fileset;
+in
 rustPlatform.buildRustPackage {
   pname = "basic";
   version = "0.1.0";
 
-  src = ./.;
+  src = fs.toSource {
+    root = ./.;
+    fileset = fs.unions [
+      ./Cargo.toml
+      ./Cargo.lock
+      ./src
+    ];
+  };
 
   cargoLock = {
     lockFile = ./Cargo.lock;
diff --git a/pkgs/build-support/rust/test/import-cargo-lock/git-dependency-branch/default.nix b/pkgs/build-support/rust/test/import-cargo-lock/git-dependency-branch/default.nix
index f274d86c52b8..3111c747d372 100644
--- a/pkgs/build-support/rust/test/import-cargo-lock/git-dependency-branch/default.nix
+++ b/pkgs/build-support/rust/test/import-cargo-lock/git-dependency-branch/default.nix
@@ -1,10 +1,19 @@
-{ rustPlatform }:
-
+{ lib, rustPlatform }:
+let
+  fs = lib.fileset;
+in
 rustPlatform.buildRustPackage {
   pname = "git-dependency-branch";
   version = "0.1.0";
 
-  src = ./.;
+  src = fs.toSource {
+    root = ./.;
+    fileset = fs.unions [
+      ./Cargo.toml
+      ./Cargo.lock
+      ./src
+    ];
+  };
 
   cargoLock = {
     lockFile = ./Cargo.lock;
diff --git a/pkgs/build-support/rust/test/import-cargo-lock/git-dependency-rev-non-workspace-nested-crate/default.nix b/pkgs/build-support/rust/test/import-cargo-lock/git-dependency-rev-non-workspace-nested-crate/default.nix
index dcf1e601c31c..63e3bea3ca1f 100644
--- a/pkgs/build-support/rust/test/import-cargo-lock/git-dependency-rev-non-workspace-nested-crate/default.nix
+++ b/pkgs/build-support/rust/test/import-cargo-lock/git-dependency-rev-non-workspace-nested-crate/default.nix
@@ -1,10 +1,19 @@
 { rustPlatform, pkg-config, openssl, lib, darwin, stdenv }:
-
+let
+  fs = lib.fileset;
+in
 rustPlatform.buildRustPackage {
   pname = "git-dependency-rev-non-workspace-nested-crate";
   version = "0.1.0";
 
-  src = ./.;
+  src = fs.toSource {
+    root = ./.;
+    fileset = fs.unions [
+      ./Cargo.toml
+      ./Cargo.lock
+      ./src
+    ];
+  };
 
   nativeBuildInputs = [
     pkg-config
diff --git a/pkgs/build-support/rust/test/import-cargo-lock/git-dependency-rev/default.nix b/pkgs/build-support/rust/test/import-cargo-lock/git-dependency-rev/default.nix
index 40487d6829a2..d3cb0fa7df81 100644
--- a/pkgs/build-support/rust/test/import-cargo-lock/git-dependency-rev/default.nix
+++ b/pkgs/build-support/rust/test/import-cargo-lock/git-dependency-rev/default.nix
@@ -1,10 +1,19 @@
-{ rustPlatform }:
-
+{ lib, rustPlatform }:
+let
+  fs = lib.fileset;
+in
 rustPlatform.buildRustPackage {
   pname = "git-dependency-rev";
   version = "0.1.0";
 
-  src = ./.;
+  src = fs.toSource {
+    root = ./.;
+    fileset = fs.unions [
+      ./Cargo.toml
+      ./Cargo.lock
+      ./src
+    ];
+  };
 
   cargoLock = {
     lockFile = ./Cargo.lock;
diff --git a/pkgs/build-support/rust/test/import-cargo-lock/git-dependency-tag/default.nix b/pkgs/build-support/rust/test/import-cargo-lock/git-dependency-tag/default.nix
index 2a2f860ac8a1..dfaa1e3028da 100644
--- a/pkgs/build-support/rust/test/import-cargo-lock/git-dependency-tag/default.nix
+++ b/pkgs/build-support/rust/test/import-cargo-lock/git-dependency-tag/default.nix
@@ -1,10 +1,19 @@
-{ rustPlatform }:
-
+{ lib, rustPlatform }:
+let
+  fs = lib.fileset;
+in
 rustPlatform.buildRustPackage {
   pname = "git-dependency-tag";
   version = "0.1.0";
 
-  src = ./.;
+  src = fs.toSource {
+    root = ./.;
+    fileset = fs.unions [
+      ./Cargo.toml
+      ./Cargo.lock
+      ./src
+    ];
+  };
 
   cargoLock = {
     lockFile = ./Cargo.lock;
diff --git a/pkgs/build-support/rust/test/import-cargo-lock/git-dependency/default.nix b/pkgs/build-support/rust/test/import-cargo-lock/git-dependency/default.nix
index 944de9b45cb5..98aa35bf8e1d 100644
--- a/pkgs/build-support/rust/test/import-cargo-lock/git-dependency/default.nix
+++ b/pkgs/build-support/rust/test/import-cargo-lock/git-dependency/default.nix
@@ -1,10 +1,19 @@
-{ rustPlatform }:
-
+{ lib, rustPlatform }:
+let
+  fs = lib.fileset;
+in
 rustPlatform.buildRustPackage {
   pname = "git-dependency";
   version = "0.1.0";
 
-  src = ./.;
+  src = fs.toSource {
+    root = ./.;
+    fileset = fs.unions [
+      ./Cargo.toml
+      ./Cargo.lock
+      ./src
+    ];
+  };
 
   cargoLock = {
     lockFile = ./Cargo.lock;
diff --git a/pkgs/build-support/rust/test/import-cargo-lock/v1/default.nix b/pkgs/build-support/rust/test/import-cargo-lock/v1/default.nix
index d13d468ae7f9..b53b7113590c 100644
--- a/pkgs/build-support/rust/test/import-cargo-lock/v1/default.nix
+++ b/pkgs/build-support/rust/test/import-cargo-lock/v1/default.nix
@@ -1,10 +1,19 @@
-{ rustPlatform }:
-
+{ lib, rustPlatform }:
+let
+  fs = lib.fileset;
+in
 rustPlatform.buildRustPackage {
   pname = "v1";
   version = "0.1.0";
 
-  src = ./.;
+  src = fs.toSource {
+    root = ./.;
+    fileset = fs.unions [
+      ./Cargo.toml
+      ./Cargo.lock
+      ./src
+    ];
+  };
 
   cargoLock = {
     lockFile = ./Cargo.lock;