diff --git a/avocado/job.py b/avocado/job.py
index 2a36f1f633cc5e472e3330f742a1eeb54b92f75b..f1c7c695658cfd1a0c979c13705713e91c7778ef 100644
--- a/avocado/job.py
+++ b/avocado/job.py
@@ -191,15 +191,31 @@ class Job(object):
         self.test_runner = test_runner_class(job=self,
                                              test_result=self.result_proxy)
 
+    def _set_output_plugins(self):
+        plugin_using_stdout = None
+        e_msg = ("Avocado could not set %s and %s both to output to stdout. ")
+        e_msg_2 = ("Please set the output flag of one of them to a file "
+                   "to avoid conflicts.")
+        for key in self.args.__dict__:
+            if key.endswith('_result'):
+                result_class = getattr(self.args, key)
+                if issubclass(result_class, result.TestResult):
+                    result_plugin = result_class(self.output_manager,
+                                                 self.args)
+                    if result_plugin.output == '-':
+                        if plugin_using_stdout is not None:
+                            e_msg %= (plugin_using_stdout.output_option,
+                                      result_plugin.output_option)
+                            self.output_manager.log_fail_header(e_msg)
+                            self.output_manager.log_fail_header(e_msg_2)
+                            sys.exit(error_codes.numeric_status['AVOCADO_JOB_FAIL'])
+                        else:
+                            plugin_using_stdout = result_plugin
+                    self.result_proxy.add_output_plugin(result_plugin)
+
     def _make_test_result(self):
         if self.args:
-            for key in self.args.__dict__:
-                if key.endswith('_result'):
-                    result_class = getattr(self.args, key)
-                    if issubclass(result_class, result.TestResult):
-                        result_plugin = result_class(self.output_manager,
-                                                     self.args)
-                        self.result_proxy.add_output_plugin(result_plugin)
+            self._set_output_plugins()
 
         if not self.result_proxy.output_plugins:
             default_plugin = result.HumanTestResult(self.output_manager, self.args)