diff --git a/bob/bio/base/tools/command_line.py b/bob/bio/base/tools/command_line.py
index 40e588327c5ca837cca0487703ed9cb2a9dea2c0..e48fae287cc3819fb0f5be8f1d310457befb48de 100644
--- a/bob/bio/base/tools/command_line.py
+++ b/bob/bio/base/tools/command_line.py
@@ -140,7 +140,7 @@ def command_line_parser(description=__doc__, exclude_resources_from=[]):
   flag_group.add_argument('-r', '--parallel', type=int,
       help = 'This flag is a shortcut for running the commands on the local machine with the given amount of parallel threads; equivalent to --grid bob.bio.base.grid.Grid("local", number_of_parallel_threads=X) --run-local-scheduler --stop-on-failure.')
       
-  flag_group.add_argument('-s', '--environment', dest='env', nargs='*', default=[], help='Passes specific environment variables to the job.')
+  flag_group.add_argument('-t', '--environment', dest='env', nargs='*', default=[], help='Passes specific environment variables to the job.')
 
   return {
     'main' : parser,