diff --git a/glue/viewers/matplotlib/viewer.py b/glue/viewers/matplotlib/viewer.py
index fc2cfcc9d..bab8e5442 100644
--- a/glue/viewers/matplotlib/viewer.py
+++ b/glue/viewers/matplotlib/viewer.py
@@ -11,7 +11,7 @@
 from echo import delay_callback
 from glue.utils import mpl_to_datetime64
 
-__all__ = ['MatplotlibViewerMixin']
+__all__ = ['MatplotlibViewerMixin', 'SimpleMatplotlibViewer']
 
 SCRIPT_HEADER = """
 # Initialize figure