diff --git a/lib/matplotlib/cbook.py b/lib/matplotlib/cbook.py
index df217258ec14..f990e597682f 100644
--- a/lib/matplotlib/cbook.py
+++ b/lib/matplotlib/cbook.py
@@ -1954,11 +1954,15 @@ def _compute_conf_interval(data, med, iqr, bootstrap):
     elif len(labels) != ncols:
         raise ValueError("Dimensions of labels and X must be compatible")
 
+    input_whis = whis
     for ii, (x, label) in enumerate(zip(X, labels), start=0):
         # empty dict
         stats = {}
         stats['label'] = label
 
+        # restore whis to the input values in case it got changed in the loop
+        whis = input_whis
+
         # arithmetic mean
         stats['mean'] = np.mean(x)