diff --git a/pkgs/development/haskell-modules/generic-builder.nix b/pkgs/development/haskell-modules/generic-builder.nix
index 83978e3bf21..4f142cd932d 100644
--- a/pkgs/development/haskell-modules/generic-builder.nix
+++ b/pkgs/development/haskell-modules/generic-builder.nix
@@ -38,7 +38,7 @@
 , patches ? [], patchPhase ? "", prePatch ? "", postPatch ? ""
 , preConfigure ? "", postConfigure ? ""
 , preBuild ? "", postBuild ? ""
-, preInstall ? "", postInstall ? ""
+, installPhase ? "", preInstall ? "", postInstall ? ""
 , checkPhase ? "", preCheck ? "", postCheck ? ""
 , preFixup ? "", postFixup ? ""
 , coreSetup ? false # Use only core packages to build Setup.hs.
@@ -305,6 +305,7 @@ stdenv.mkDerivation ({
 // optionalAttrs (preCheck != "")       { inherit preCheck; }
 // optionalAttrs (postCheck != "")      { inherit postCheck; }
 // optionalAttrs (preInstall != "")     { inherit preInstall; }
+// optionalAttrs (installPhase != "")   { inherit installPhase; }
 // optionalAttrs (postInstall != "")    { inherit postInstall; }
 // optionalAttrs (preFixup != "")       { inherit preFixup; }
 // optionalAttrs (postFixup != "")      { inherit postFixup; }