diff --git a/fluidsim/base/output/base.py b/fluidsim/base/output/base.py
index 43a384fd6618415faecf9ce0607ce0babaf38548_Zmx1aWRzaW0vYmFzZS9vdXRwdXQvYmFzZS5weQ==..6c4728537a3bea8b57458b374da73a1eb5f07bc7_Zmx1aWRzaW0vYmFzZS9vdXRwdXQvYmFzZS5weQ== 100644
--- a/fluidsim/base/output/base.py
+++ b/fluidsim/base/output/base.py
@@ -367,10 +367,7 @@
         self.period_show = params.output.period_refresh_plots
         self.t_last_show = 0.
 
-        if name_file is not None:
-            self.path_file = self.output.path_run + '/' + name_file
-        else:
-            self.init_path_files()
+        self.init_path_files()
 
         if self.has_to_plot and mpi.rank == 0:
             self.init_online_plot()
@@ -383,7 +380,8 @@
 
     def init_path_files(self):
         if hasattr(self, '_name_file'):
-            self.path_file = os.path.join(self.output.path_run, self._name_file)
+            self.path_file = os.path.join(
+                self.output.path_run, self._name_file)
 
     def init_files(self, dico_arrays_1time=None):
         if dico_arrays_1time is None:
diff --git a/fluidsim/base/test/test_base_solver.py b/fluidsim/base/test/test_base_solver.py
index 43a384fd6618415faecf9ce0607ce0babaf38548_Zmx1aWRzaW0vYmFzZS90ZXN0L3Rlc3RfYmFzZV9zb2x2ZXIucHk=..6c4728537a3bea8b57458b374da73a1eb5f07bc7_Zmx1aWRzaW0vYmFzZS90ZXN0L3Rlc3RfYmFzZV9zb2x2ZXIucHk= 100644
--- a/fluidsim/base/test/test_base_solver.py
+++ b/fluidsim/base/test/test_base_solver.py
@@ -6,6 +6,9 @@
 
 import fluiddyn as fld
 
+# to get fld.show
+# import fluiddyn.output
+
 from fluidsim.base.solvers.pseudo_spect import SimulBasePseudoSpectral
 
 from fluiddyn.io import stdout_redirected