diff --git a/pkgs/os-specific/linux/perf-tools/default.nix b/pkgs/os-specific/linux/perf-tools/default.nix
index 31f86965ee8..ee12251ae5e 100644
--- a/pkgs/os-specific/linux/perf-tools/default.nix
+++ b/pkgs/os-specific/linux/perf-tools/default.nix
@@ -34,10 +34,11 @@ stdenv.mkDerivation {
       mv $d/man $out/share/
     '';
 
-  meta = {
-    platforms = lib.platforms.linux;
+  meta = with stdenv.lib; {
+    platforms = platforms.linux;
     homepage = https://github.com/brendangregg/perf-tools;
     description = "Performance analysis tools based on Linux perf_events (aka perf) and ftrace";
-    maintainers = [ lib.maintainers.eelco ];
+    maintainers = [ maintainers.eelco ];
+    license = licenses.gpl2;
   };
 }