diff --git a/pkgs/development/haskell-modules/lib.nix b/pkgs/development/haskell-modules/lib.nix
index bb2cf8b36f05..af1c4d5b0e88 100644
--- a/pkgs/development/haskell-modules/lib.nix
+++ b/pkgs/development/haskell-modules/lib.nix
@@ -40,6 +40,18 @@ rec {
     overrideScope = scope: overrideCabal (drv.overrideScope scope) f;
   };
 
+  # : Map Name (Either Path VersionNumber) -> HaskellPackageOverrideSet
+  # Given a set whose values are either paths or version strings, produces
+  # a package override set (i.e. (self: super: { etc. })) that sets
+  # the packages named in the input set to the corresponding versions
+  packageSourceOverrides =
+    overrides: self: super: pkgs.lib.mapAttrs (name: src:
+      let isPath = x: builtins.substring 0 1 (toString x) == "/";
+          generateExprs = if isPath src
+                             then self.callCabal2nix
+                             else self.callHackage;
+      in generateExprs name src {}) overrides;
+
   /* doCoverage modifies a haskell package to enable the generation
      and installation of a coverage report.
 
diff --git a/pkgs/development/haskell-modules/make-package-set.nix b/pkgs/development/haskell-modules/make-package-set.nix
index b91d73c9748c..dc4d3f82bdef 100644
--- a/pkgs/development/haskell-modules/make-package-set.nix
+++ b/pkgs/development/haskell-modules/make-package-set.nix
@@ -139,6 +139,8 @@ in package-set { inherit pkgs stdenv callPackage; } self // {
 
     inherit mkDerivation callPackage haskellSrc2nix hackage2nix;
 
+    inherit (haskellLib) packageSourceOverrides;
+
     callHackage = name: version: self.callPackage (self.hackage2nix name version);
 
     # Creates a Haskell package from a source package by calling cabal2nix on the source.
@@ -155,18 +157,6 @@ in package-set { inherit pkgs stdenv callPackage; } self // {
           };
       }) args) (_: { inherit src; });
 
-    # : Map Name (Either Path VersionNumber) -> HaskellPackageOverrideSet
-    # Given a set whose values are either paths or version strings, produces
-    # a package override set (i.e. (self: super: { etc. })) that sets
-    # the packages named in the input set to the corresponding versions
-    packageSourceOverrides =
-      overrides: self: super: pkgs.lib.mapAttrs (name: src:
-        let isPath = x: builtins.substring 0 1 (toString x) == "/";
-            generateExprs = if isPath src
-                               then self.callCabal2nix
-                               else self.callHackage;
-        in generateExprs name src {}) overrides;
-
     # : { root : Path
     #   , source-overrides : Defaulted (Either Path VersionNumber)
     #   , overrides : Defaulted (HaskellPackageOverrideSet)