diff --git a/taskcluster/mach_commands.py b/taskcluster/mach_commands.py
index fa481abc9a5a..98b60a4bfde4 100644
--- a/taskcluster/mach_commands.py
+++ b/taskcluster/mach_commands.py
@@ -152,6 +152,8 @@ class MachCommands(MachCommandBase):
                      help='SCM level of this repository')
     @CommandArgument('--target-tasks-method',
                      help='method for selecting the target tasks to generate')
+    @CommandArgument('--try-task-config-file',
+                     help='path to try task configuration file')
     def taskgraph_decision(self, **options):
         """Run the decision task: generate a task graph and submit to
         TaskCluster.  This is only meant to be called within decision tasks,
diff --git a/taskcluster/taskgraph/decision.py b/taskcluster/taskgraph/decision.py
index b5428c9849f9..eaf4d4139b25 100644
--- a/taskcluster/taskgraph/decision.py
+++ b/taskcluster/taskgraph/decision.py
@@ -203,13 +203,17 @@ def get_decision_parameters(options):
     if 'nightly' in parameters.get('target_tasks_method', ''):
         parameters['release_history'] = populate_release_history('Firefox', project)
 
-    # if try_task_config.json is present, load it
-    task_config_file = os.path.join(os.getcwd(), 'try_task_config.json')
+    if options.get('try_task_config_file'):
+        task_config_file = os.path.abspath(options.get('try_task_config_file'))
+    else:
+        # if try_task_config.json is present, load it
+        task_config_file = os.path.join(os.getcwd(), 'try_task_config.json')
 
     # load try settings
     if 'try' in project:
         parameters['try_mode'] = None
         if os.path.isfile(task_config_file):
+            logger.info("using try tasks from {}".format(task_config_file))
             parameters['try_mode'] = 'try_task_config'
             with open(task_config_file, 'r') as fh:
                 parameters['try_task_config'] = json.load(fh)