diff --git a/pkgs/stdenv/generic/check-meta.nix b/pkgs/stdenv/generic/check-meta.nix
index 4c218b24d11d..1118e6837f29 100644
--- a/pkgs/stdenv/generic/check-meta.nix
+++ b/pkgs/stdenv/generic/check-meta.nix
@@ -113,7 +113,9 @@ let
 
   showLicenseOrSourceType = value: toString (map (v: v.shortName or "unknown") (lib.lists.toList value));
   showLicense = showLicenseOrSourceType;
-  showPlatforms = value: lib.optionalString (builtins.isList value && builtins.all builtins.isString value) (toString value);
+  showPlatforms = attrs: toString (builtins.filter
+    (system: lib.meta.availableOn (lib.systems.elaborate { inherit system; }) attrs)
+    lib.platforms.all);
   showSourceType = showLicenseOrSourceType;
 
   pos_str = meta: meta.position or "«unknown-file»";
@@ -369,7 +371,7 @@ let
     else if !allowBroken && attrs.meta.broken or false then
       { valid = "no"; reason = "broken"; errormsg = "is marked as broken"; }
     else if !allowUnsupportedSystem && hasUnsupportedPlatform attrs then
-      { valid = "no"; reason = "unsupported"; errormsg = "is only supported on `${showPlatforms attrs.meta.platforms}` but not on requested ‘${hostPlatform.system}’"; }
+      { valid = "no"; reason = "unsupported"; errormsg = "is only supported on `${showPlatforms attrs}` but not on requested ‘${hostPlatform.system}’"; }
     else if !(hasAllowedInsecure attrs) then
       { valid = "no"; reason = "insecure"; errormsg = "is marked as insecure"; }