diff --git a/pypreprocess/reporting/preproc_reporter.py b/pypreprocess/reporting/preproc_reporter.py
index 1c203bff..f4827de9 100644
--- a/pypreprocess/reporting/preproc_reporter.py
+++ b/pypreprocess/reporting/preproc_reporter.py
@@ -869,7 +869,6 @@ def _get_time_series_from_voxel(x, voxel):
                                        'stc_plot_%s.png' % session_id)
         pl.figure()
         pl.plot(o_ts, 'o-')
-        pl.hold('on')
         pl.plot(stc_ts, 's-')
         pl.legend(('original BOLD', 'ST corrected BOLD'))
         pl.title("session %s: STC QA for voxel (%s, %s, %s)" % (
diff --git a/pypreprocess/time_diff.py b/pypreprocess/time_diff.py
index c474f0db..119774cd 100644
--- a/pypreprocess/time_diff.py
+++ b/pypreprocess/time_diff.py
@@ -230,11 +230,9 @@ def plot_session_starts(ax):
 
     # slice plots min max mean
     ax = next(iter_axes)
-    ax.hold(True)
     ax.plot(np.mean(scaled_slice_diff, 0), 'k')
     ax.plot(np.min(scaled_slice_diff, 0), 'b')
     ax.plot(np.max(scaled_slice_diff, 0), 'r')
-    ax.hold(False)
     xmax_labels(ax, S + 1, 'Slice number',
                 'Max/mean/min \n slice variation')