diff --git a/lib/render_queue.py b/lib/render_queue.py
index c7b857c..eebec25 100755
--- a/lib/render_queue.py
+++ b/lib/render_queue.py
@@ -47,7 +47,7 @@ class RenderQueue:
     session = Session()
     ScheduledJob.register_user_events()
     job_queue = []
-    maximum_renderer_instances = {'blender': 2, 'aerender': 1, 'ffmpeg': 4}
+    maximum_renderer_instances = {'blender': 1, 'aerender': 1, 'ffmpeg': 4}
     hostname = None
     port = 8080
     client_mode = False
@@ -119,12 +119,10 @@ class RenderQueue:
 
     @classmethod
     def evaluate_queue(cls):
-
-        instances = cls.renderer_instances()
-
         not_started = cls.jobs_with_status(RenderStatus.NOT_STARTED, priority_sorted=True)
         if not_started:
             for job in not_started:
+                instances = cls.renderer_instances()
                 higher_priority_jobs = [x for x in cls.running_jobs() if x.priority < job.priority]
                 max_renderers = job.renderer in instances.keys() and instances[
                     job.renderer] >= cls.maximum_renderer_instances.get(job.renderer, 1)