diff --git a/include/GafferScene/SceneAlgo.inl b/include/GafferScene/SceneAlgo.inl
index 9b4cf7c1c1..bd87825803 100644
--- a/include/GafferScene/SceneAlgo.inl
+++ b/include/GafferScene/SceneAlgo.inl
@@ -192,7 +192,10 @@ void parallelGatherLocations( const ScenePlug *scene, LocationFunctor &&location
 
 	using LocationResult = std::invoke_result_t<LocationFunctor, const ScenePlug *, const ScenePlug::ScenePath &>;
 	tbb::concurrent_bounded_queue<std::optional<LocationResult>> queue;
-	queue.set_capacity( tbb::this_task_arena::max_concurrency() );
+	queue.set_capacity( std::max( tbb::this_task_arena::max_concurrency(), 1 ) );
+
+	std::cerr << "MAX CONCURRENCY " << tbb::this_task_arena::max_concurrency() << std::endl;
+	std::cerr << "CAPACITY " << queue.capacity() << std::endl;
 
 	auto locationFunctorWrapper = [&] ( const ScenePlug *scene, const ScenePlug::ScenePath &path ) {
 		queue.push( locationFunctor( scene, path ) );