diff --git a/pkgs/sonar/default.nix b/pkgs/sonar/default.nix
index b362976..69b0ddc 100644
--- a/pkgs/sonar/default.nix
+++ b/pkgs/sonar/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
   version = "0.1.0";
   src = builtins.fetchGit {
     url = "ssh://git@bscpm03.bsc.es/ovni/sonar";
-    ref = version;
+    ref = "refs/tags/${version}";
     rev = "1299731b56addc18f530f7327f62267624c4363a";
   };
   hardeningDisable = [ "all" ];