diff --git a/arviz/plots/posteriorplot.py b/arviz/plots/posteriorplot.py
index 6e07d0394c..25170d50b4 100644
--- a/arviz/plots/posteriorplot.py
+++ b/arviz/plots/posteriorplot.py
@@ -130,7 +130,7 @@ def display_point_estimate():
             point_value = trace_values.mean()
         elif point_estimate == 'mode':
             if isinstance(trace_values.iloc[0], float):
-                density, lower, upper = fast_kde(trace_values, bw)
+                density, lower, upper = fast_kde(trace_values, bw=bw)
                 x = np.linspace(lower, upper, len(density))
                 point_value = x[np.argmax(density)]
             else:
diff --git a/arviz/plots/traceplot.py b/arviz/plots/traceplot.py
index 51e8fadb6b..919360626c 100644
--- a/arviz/plots/traceplot.py
+++ b/arviz/plots/traceplot.py
@@ -140,7 +140,7 @@ def _kdeplot_op(ax, data, bw, linewidth, prior=None, prior_shade=1, prior_style=
     errored = []
     for i, col in enumerate(data.T):
         try:
-            density, lower, upper = fast_kde(col, bw)
+            density, lower, upper = fast_kde(col, bw=bw)
             x = np.linspace(lower, upper, len(density))
             densities.append(ax.plot(x, density, lw=linewidth))
             if prior is not None: