diff --git a/pkgs/by-name/ta/tamgamp-lv2/package.nix b/pkgs/by-name/ta/tamgamp-lv2/package.nix
index 9afcf0dd810b..341507d50a51 100644
--- a/pkgs/by-name/ta/tamgamp-lv2/package.nix
+++ b/pkgs/by-name/ta/tamgamp-lv2/package.nix
@@ -9,7 +9,7 @@
 
 stdenv.mkDerivation {
   pname = "tamgamp.lv2";
-  version = "unstable-2020-06-14";
+  version = "0-unstable-2020-06-14";
 
   src = fetchFromGitHub {
     owner = "sadko4u";