diff --git a/lineflow/simulation/stations.py b/lineflow/simulation/stations.py
index 1758705..bf2ab87 100644
--- a/lineflow/simulation/stations.py
+++ b/lineflow/simulation/stations.py
@@ -415,12 +415,11 @@ def run(self):
 
         while True:
             if self.is_on():
-
-                yield self.env.process(self.request_workers())
-                self.state['n_workers'].update(self.n_workers)
                 # Wait to get part from buffer_in
                 yield self.env.process(self.set_to_waiting())
                 carrier = yield self.env.process(self.buffer_in())
+                yield self.env.process(self.request_workers())
+                self.state['n_workers'].update(self.n_workers)
 
                 # Update current_carrier and count parts of carrier
                 self.state['carrier'].update(carrier.name)
@@ -550,11 +549,11 @@ def run(self):
 
         while True:
             if self.is_on():
-                yield self.env.process(self.request_workers())
-                self.state['n_workers'].update(self.n_workers)
                 # Wait to get part from buffer_in
                 yield self.env.process(self.set_to_waiting())
                 carrier = yield self.env.process(self.buffer_in())
+                yield self.env.process(self.request_workers())
+                self.state['n_workers'].update(self.n_workers)
                 self.state['carrier'].update(carrier.name)
 
                 yield self.env.process(self.set_to_work())