diff --git a/distribution/lib/Standard/Visualization/0.0.0-dev/src/Table/Visualization.enso b/distribution/lib/Standard/Visualization/0.0.0-dev/src/Table/Visualization.enso
index f96437b695b19..b992b290c7a7c 100644
--- a/distribution/lib/Standard/Visualization/0.0.0-dev/src/Table/Visualization.enso
+++ b/distribution/lib/Standard/Visualization/0.0.0-dev/src/Table/Visualization.enso
@@ -26,7 +26,7 @@ prepare_visualization y max_rows=1000 = Helpers.recover_errors <|
             dataframe = x.take (First max_rows)
             all_rows_count = x.row_count
             included_rows = dataframe.row_count
-            index = Dataframe_Column.from_vector "" (Vector.new included_rows i->i)
+            index = Dataframe_Column.from_vector "#" (Vector.new included_rows i->i)
 
             make_json dataframe [index] all_rows_count
 
diff --git a/test/Visualization_Tests/src/Table_Spec.enso b/test/Visualization_Tests/src/Table_Spec.enso
index b29826d730f20..a7c9bedbe7672 100644
--- a/test/Visualization_Tests/src/Table_Spec.enso
+++ b/test/Visualization_Tests/src/Table_Spec.enso
@@ -59,12 +59,12 @@ visualization_spec connection =
         t2 = Table.new [["A", [1, 2, 3]], ["B", [4, 5, 6]], ["C", [7, 8, 9]]]
         Test.specify "should visualize dataframe tables" <|
             vis = Visualization.prepare_visualization t2 1
-            json = make_json header=["A", "B", "C"] data=[[1], [4], [7]] all_rows=3 ixes_header=[""] ixes=[[0]]
+            json = make_json header=["A", "B", "C"] data=[[1], [4], [7]] all_rows=3 ixes_header=["#"] ixes=[[0]]
             vis . should_equal json
 
         Test.specify "should visualize dataframe columns" <|
             vis = Visualization.prepare_visualization (t2.at "A") 2
-            json = make_json header=["A"] data=[[1, 2]] all_rows=3 ixes_header=[""] ixes=[[0, 1]]
+            json = make_json header=["A"] data=[[1, 2]] all_rows=3 ixes_header=["#"] ixes=[[0, 1]]
             vis . should_equal json
 
         Test.specify "should handle Vectors" <|