diff --git a/pkgs/by-name/li/libmatthew_java/package.nix b/pkgs/by-name/li/libmatthew_java/package.nix
index c11ae7a4a681..a6ad4e205932 100644
--- a/pkgs/by-name/li/libmatthew_java/package.nix
+++ b/pkgs/by-name/li/libmatthew_java/package.nix
@@ -15,8 +15,12 @@ stdenv.mkDerivation (finalAttrs: {
     url = "https://src.fedoraproject.org/repo/pkgs/libmatthew-java/libmatthew-java-${finalAttrs.version}.tar.gz/8455b8751083ce25c99c2840609271f5/libmatthew-java-${finalAttrs.version}.tar.gz";
     sha256 = "1yldkhsdzm0a41a0i881bin2jklhp85y3ah245jd6fz3npcx7l85";
   };
-  JAVA_HOME = jdk;
-  PREFIX = "\${out}";
+
+  env = {
+    JAVA_HOME = jdk;
+    PREFIX = "\${out}";
+  };
+
   buildInputs = [ jdk ];
 
   meta = {