diff --git a/pkgs/build-support/php/builders/v2/build-composer-project.nix b/pkgs/build-support/php/builders/v2/build-composer-project.nix
index f3cff848ddab..8654c0d7a4f7 100644
--- a/pkgs/build-support/php/builders/v2/build-composer-project.nix
+++ b/pkgs/build-support/php/builders/v2/build-composer-project.nix
@@ -111,7 +111,7 @@ let
       };
 
       meta = meta // {
-        platforms = lib.platforms.all;
+        platforms = meta.platforms or lib.platforms.all;
       };
     };
 in