diff --git a/pkgs/development/libraries/grantlee/5/default.nix b/pkgs/development/libraries/grantlee/5/default.nix
index 3b14efe8a5f..45096e031d3 100644
--- a/pkgs/development/libraries/grantlee/5/default.nix
+++ b/pkgs/development/libraries/grantlee/5/default.nix
@@ -3,8 +3,7 @@
 mkDerivation rec {
   pname = "grantlee";
   version = "5.1.0";
-  grantleeCompatVersion = "5.1";
-  grantleePluginPrefix = "lib/grantlee/${grantleeCompatVersion}";
+  grantleePluginPrefix = "lib/grantlee/${lib.versions.majorMinor version}";
 
   src = fetchurl {
     url = "https://github.com/steveire/grantlee/archive/v${version}.tar.gz";