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-rw-r--r--pkgs/development/haskell-modules/generic-builder.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/haskell-modules/generic-builder.nix b/pkgs/development/haskell-modules/generic-builder.nix
index 77bde5c85b7..2a71e7e92d1 100644
--- a/pkgs/development/haskell-modules/generic-builder.nix
+++ b/pkgs/development/haskell-modules/generic-builder.nix
@@ -391,7 +391,7 @@ stdenv.mkDerivation ({
         rmdir "$packageConfFile"
       fi
       for packageConfFile in "$packageConfDir/"*; do
-        local pkgId=$( ${gnused}/bin/sed -n -e 's|^id: ||p' $packageConfFile )
+        local pkgId=$( ${gnused}/bin/sed -n -e 's|^id:[ ]\+||p' $packageConfFile )
         mv $packageConfFile $packageConfDir/$pkgId.conf
       done