diff --git a/pkgs/development/java-modules/m2install.nix b/pkgs/development/java-modules/m2install.nix
index 3a289c9c9c4a..d0a13f62520f 100644
--- a/pkgs/development/java-modules/m2install.nix
+++ b/pkgs/development/java-modules/m2install.nix
@@ -12,10 +12,10 @@ let
 in stdenv.mkDerivation {
   inherit name m2Path m2File src;
 
+  dontUnpack = true;
+
   installPhase = ''
     mkdir -p $out/m2/$m2Path
     cp $src $out/m2/$m2Path/$m2File
   '';
-
-  phases = "installPhase";
 }