diff --git a/Dockerfile b/Dockerfile
index 82d669f..85218e9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -64,10 +64,5 @@ USER sogo
 # load env
 RUN . /usr/share/GNUstep/Makefiles/GNUstep.sh
 
-# Number of Workers - has an impact on performance
-# you can tweak this parameters using --env when launching `docker run`
-# ex. : `docker run --env WorkersCount=8 sogo-image
-ENV WorkersCount 4
-
-CMD [ "sogod", "-WOUseWatchDog", " NO", "-WONoDetach", "YES", "-WOPort", "20000", "-WOWorkersCount", "${WorkersCount}", "-WOLogFile", "-", "-WOPidFile", "/tmp/sogo.pid"]
+CMD [ "sogod", "-WONoDetach", "YES", "-WOPort", "20000", "-WOLogFile", "-", "-WOPidFile", "/tmp/sogo.pid"]
 
diff --git a/sogo.default.conf b/sogo.default.conf
index 6fdd508..89cf3cc 100644
--- a/sogo.default.conf
+++ b/sogo.default.conf
@@ -127,6 +127,12 @@
 
   // reach memcached through docker
   SOGoMemcachedHost = "memcached";
+  
+  // this has a great impact on performance: you should adjust the number
+  // of workers according to the number of users and the performance of your
+  // machine
+  WorkersCount = 4;
+