diff --git a/packages/vaex-viz/vaex/viz/mpl.py b/packages/vaex-viz/vaex/viz/mpl.py
index <HASH>..<HASH> 100644
--- a/packages/vaex-viz/vaex/viz/mpl.py
+++ b/packages/vaex-viz/vaex/viz/mpl.py
@@ -843,7 +843,7 @@ def plot(self, x=None, y=None, z=None, what="count(*)", vwhat=None, reduce=["col
     if show:
         pylab.show()
     if return_extra:
-        return im, grid, fgrid, ngrid, rgrid, rgba8
+        return im, grid, fgrid, ngrid, rgrid
     else:
         return im
     # colorbar = None
Removed unused, undefined variable in the `plot` method.