diff --git a/HySoP/hysop/operator/monitors/printer.py b/HySoP/hysop/operator/monitors/printer.py
index 96ef3be66e6cceaaac46a5aa184d392f1407276d..b42f9abe6b731ae27a900d2bd40d678f6fda6cd4 100644
--- a/HySoP/hysop/operator/monitors/printer.py
+++ b/HySoP/hysop/operator/monitors/printer.py
@@ -130,7 +130,7 @@ class Printer(Monitoring):
                               for i in xrange(topo.mesh.dim)])
                 spacing = tuple(topo.mesh.space_step)
                 evtk.imageToVTK(filename, origin=orig, spacing=spacing,
-                                pointData=self._build_vtk_dict()))
+                                pointData=self._build_vtk_dict())
             except IOError:
                 if self.variables[0].domain.dimension == 2:
                     ## Standard output