diff --git a/visidata/graph.py b/visidata/graph.py
index e9b5c1858..4ed6da6f7 100644
--- a/visidata/graph.py
+++ b/visidata/graph.py
@@ -72,6 +72,8 @@ def startCursor(self):
 
 # provides axis labels, legend
 class GraphSheet(InvertedCanvas):
+    rowtype = 'points'
+
     def __init__(self, *names, **kwargs):
         self.ylabel_maxw = 0
         super().__init__(*names, **kwargs)