diff --git a/scripts/base/frameworks/config/main.zeek b/scripts/base/frameworks/config/main.zeek
index 5fe7f6eaaf..2d87e3c09e 100644
--- a/scripts/base/frameworks/config/main.zeek
+++ b/scripts/base/frameworks/config/main.zeek
@@ -127,13 +127,9 @@ function format_value(value: any) : string
 
 	if ( /^set/ in tn && strstr(tn, ",") == 0 )
 		{
-		# The conversion to set here is tricky and assumes
-		# that the set isn't indexed via a tuple of types.
-		# The above check for commas in the type name
-		# ensures this.
-		local it: set[bool] = value;
-		for ( sv in it )
-			part += cat(sv);
+		local vec = Option::any_set_to_any_vec(value);
+		for ( sv in vec )
+			part += cat(vec[sv]);
 		return join_string_vec(part, ",");
 		}
 	else if ( /^vector/ in tn )
diff --git a/src/option.bif b/src/option.bif
index 496baae0cc..ad40ae388c 100644
--- a/src/option.bif
+++ b/src/option.bif
@@ -213,3 +213,30 @@ function Option::set_change_handler%(ID: string, on_change: any, priority: int &
 	i->AddOptionHandler(func, -priority);
 	return zeek::val_mgr->True();
 	%}
+
+## Helper function that converts a set (of arbitrary index type) to
+## a "vector of any".
+##
+## v: an "any" type corresponding to a set.
+##
+## Returns: a vector-of-any with one element for each member of v.
+function Option::any_set_to_any_vec%(v: any%): any_vec
+	%{
+	auto ret_type = make_intrusive<VectorType>(base_type(TYPE_ANY));
+	auto ret = make_intrusive<VectorVal>(ret_type);
+	const auto& t = v->GetType();
+
+	if ( ! t->IsSet() )
+		{
+		zeek::emit_builtin_error("argument is not a set");
+		return ret;
+		}
+
+	auto lv = v->AsTableVal()->ToListVal();
+	auto n = lv->Length();
+
+	for ( int i = 0; i < n; ++i )
+		ret->Assign(i, lv->Idx(i));
+
+	return ret;
+	%}