diff --git a/pkgs/servers/sql/postgresql/ext/timescaledb_toolkit.nix b/pkgs/servers/sql/postgresql/ext/timescaledb_toolkit.nix
index 96bff3fe20b3..eb2f5750059e 100644
--- a/pkgs/servers/sql/postgresql/ext/timescaledb_toolkit.nix
+++ b/pkgs/servers/sql/postgresql/ext/timescaledb_toolkit.nix
@@ -40,7 +40,7 @@
     homepage = "https://github.com/timescale/timescaledb-toolkit";
     maintainers = with maintainers; [ typetetris ];
     platforms = postgresql.meta.platforms;
-    license = licenses.asl20;
+    license = licenses.tsl;
 
     # as it needs to be used with timescaledb, simply use the condition from there
     broken = stdenv.isDarwin;