diff --git a/pkgs/test/haskell/setBuildTarget/default.nix b/pkgs/test/haskell/setBuildTarget/default.nix
index 012bce8541e6..68f9b25dba75 100644
--- a/pkgs/test/haskell/setBuildTarget/default.nix
+++ b/pkgs/test/haskell/setBuildTarget/default.nix
@@ -1,7 +1,7 @@
 { pkgs, haskellPackages }:
 
 let
-  # This can be regenerated by running `cabal2nix .` in the current directory.
+  # This can be regenerated by running `cabal2nix ./src` in the current directory.
   pkgDef =
     {
       mkDerivation,
@@ -11,19 +11,11 @@ let
     mkDerivation {
       pname = "haskell-setBuildTarget";
       version = "0.1.0.0";
-      src = lib.fileset.toSource {
-        root = ./.;
-        fileset = lib.fileset.unions [
-          ./haskell-setBuildTarget.cabal
-          ./Bar.hs
-          ./Foo.hs
-          ./Setup.hs
-        ];
-      };
+      src = ./src;
       isLibrary = false;
       isExecutable = true;
       executableHaskellDepends = [ base ];
-      license = lib.licenses.bsd3;
+      license = "unknown";
     };
 
   drv = haskellPackages.callPackage pkgDef { };
diff --git a/pkgs/test/haskell/setBuildTarget/Bar.hs b/pkgs/test/haskell/setBuildTarget/src/Bar.hs
similarity index 100%
rename from pkgs/test/haskell/setBuildTarget/Bar.hs
rename to pkgs/test/haskell/setBuildTarget/src/Bar.hs
diff --git a/pkgs/test/haskell/setBuildTarget/Foo.hs b/pkgs/test/haskell/setBuildTarget/src/Foo.hs
similarity index 100%
rename from pkgs/test/haskell/setBuildTarget/Foo.hs
rename to pkgs/test/haskell/setBuildTarget/src/Foo.hs
diff --git a/pkgs/test/haskell/setBuildTarget/Setup.hs b/pkgs/test/haskell/setBuildTarget/src/Setup.hs
similarity index 100%
rename from pkgs/test/haskell/setBuildTarget/Setup.hs
rename to pkgs/test/haskell/setBuildTarget/src/Setup.hs
diff --git a/pkgs/test/haskell/setBuildTarget/haskell-setBuildTarget.cabal b/pkgs/test/haskell/setBuildTarget/src/haskell-setBuildTarget.cabal
similarity index 100%
rename from pkgs/test/haskell/setBuildTarget/haskell-setBuildTarget.cabal
rename to pkgs/test/haskell/setBuildTarget/src/haskell-setBuildTarget.cabal