diff --git a/pkgs/build-support/build-fhsenv-bubblewrap/default.nix b/pkgs/build-support/build-fhsenv-bubblewrap/default.nix
index 5e8894d7cb33..f4942290af4b 100644
--- a/pkgs/build-support/build-fhsenv-bubblewrap/default.nix
+++ b/pkgs/build-support/build-fhsenv-bubblewrap/default.nix
@@ -31,7 +31,7 @@ assert (pname != null || version != null) -> (name == null && pname != null); #
 
 with builtins;
 let
-  pname = if args.name != null then args.name else args.pname;
+  pname = if args ? name && args.name != null then args.name else args.pname;
   versionStr = lib.optionalString (version != null) ("-" + version);
   name = pname + versionStr;