diff --git a/pkgs/applications/audio/hybridreverb2/default.nix b/pkgs/applications/audio/hybridreverb2/default.nix
index 707deeb1a013..8cd7cc50f748 100644
--- a/pkgs/applications/audio/hybridreverb2/default.nix
+++ b/pkgs/applications/audio/hybridreverb2/default.nix
@@ -22,7 +22,8 @@
 
 let
   pname = "HybridReverb2";
-  version = "2.1.2";
+  version = "2.1.2-unstable-2021-12-19";
+  rev = "2fc44c419f90133b3fcde71820212b5f281a0ad2";
   owner = "jpcima";
   DBversion = "1.0.0";
 in
@@ -40,8 +41,8 @@ stdenv.mkDerivation rec {
   src = fetchFromGitHub {
     inherit owner;
     repo = pname;
-    rev = "v${version}";
-    sha256 = "16r20plz1w068bgbkrydv01a991ygjybdya3ah7bhp3m5xafjwqb";
+    rev = rev;
+    hash = "sha256-+uwTKHQ3nIWKbBCPtf/axvyW6MU0gemVtd2ZqqiT/w0=";
     fetchSubmodules = true;
   };
 
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 79183b9b860c..c2cea37b8256 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9284,9 +9284,7 @@ with pkgs;
 
   hw-probe = perlPackages.callPackage ../tools/system/hw-probe { };
 
-  hybridreverb2 = callPackage ../applications/audio/hybridreverb2 {
-    stdenv = gcc8Stdenv;
-  };
+  hybridreverb2 = callPackage ../applications/audio/hybridreverb2 { };
 
   hylafaxplus = callPackage ../servers/hylafaxplus {
     # libtiff >= 4.6 dropped many executables needed by hylafaxplus