diff --git a/pkgs/development/tools/build-managers/rebar/default.nix b/pkgs/development/tools/build-managers/rebar/default.nix
index b028534f3c86..98cd7e136d22 100644
--- a/pkgs/development/tools/build-managers/rebar/default.nix
+++ b/pkgs/development/tools/build-managers/rebar/default.nix
@@ -36,5 +36,6 @@ stdenv.mkDerivation {
 
     platforms = stdenv.lib.platforms.unix;
     maintainers = [ stdenv.lib.maintainers.the-kenny ];
+    license = stdenv.lib.licenses.asl20;
   };
 }