diff --git a/pkgs/development/tools/build-managers/gradle/default.nix b/pkgs/development/tools/build-managers/gradle/default.nix
index 2540f210d423..d8a277b57e23 100644
--- a/pkgs/development/tools/build-managers/gradle/default.nix
+++ b/pkgs/development/tools/build-managers/gradle/default.nix
@@ -288,7 +288,7 @@ rec {
             tests = {
               toolchains =
                 let
-                  javaVersion = lib.substring 0 2 (lib.getVersion jdk23);
+                  javaVersion = lib.versions.major (lib.getVersion jdk23);
                 in
                 runCommand "detects-toolchains-from-nix-env"
                   {