diff --git a/pkgs/development/interpreters/lfe/generic-builder.nix b/pkgs/development/interpreters/lfe/generic-builder.nix
index 2e2dfcf91cc7..1589121d998d 100644
--- a/pkgs/development/interpreters/lfe/generic-builder.nix
+++ b/pkgs/development/interpreters/lfe/generic-builder.nix
@@ -3,9 +3,10 @@
 { baseName ? "lfe"
 , version
 , maximumOTPVersion
-, sha256 ? null
+, sha256 ? ""
+, hash ? ""
 , rev ? version
-, src ? fetchFromGitHub { inherit rev sha256; owner = "lfe"; repo = "lfe"; }
+, src ? fetchFromGitHub { inherit hash rev sha256; owner = "lfe"; repo = "lfe"; }
 , patches ? []
 }: