diff --git a/plotly/tools.py b/plotly/tools.py
index f7342c6447a..f2a3d98b709 100644
--- a/plotly/tools.py
+++ b/plotly/tools.py
@@ -3338,7 +3338,7 @@ def _trisurf(x, y, z, simplices, show_colorbar, edges_color,
                 facecolor.append(color)
 
         # Make sure facecolor is a list so output is consistent across Pythons
-        facecolor = list(facecolor)
+        facecolor = np.asarray(facecolor)
         ii, jj, kk = simplices.T
 
         triangles = graph_objs.Mesh3d(x=x, y=y, z=z, facecolor=facecolor,