diff --git a/src/traces/scattergl/convert.js b/src/traces/scattergl/convert.js
index 1b4c361897d..60725bb1aa8 100644
--- a/src/traces/scattergl/convert.js
+++ b/src/traces/scattergl/convert.js
@@ -272,7 +272,7 @@ proto.update = function(options) {
 // also, there are quite a few differences
 function allFastTypesLikely(a) {
     var len = a.length,
-        inc = Math.max(0, (len - 1) / Math.min(Math.max(len, 1), 1000)),
+        inc = Math.max(1, (len - 1) / Math.min(Math.max(len, 1), 1000)),
         ai;
 
     for(var i = 0; i < len; i += inc) {
diff --git a/test/image/baselines/gl2d_scatter-colorscale-colorbar.png b/test/image/baselines/gl2d_scatter-colorscale-colorbar.png
index b16a9b65429..20fe6f7d35b 100644
Binary files a/test/image/baselines/gl2d_scatter-colorscale-colorbar.png and b/test/image/baselines/gl2d_scatter-colorscale-colorbar.png differ
diff --git a/test/image/mocks/gl2d_scatter-colorscale-colorbar.json b/test/image/mocks/gl2d_scatter-colorscale-colorbar.json
index 9750e8a3f2b..9a5587bae54 100644
--- a/test/image/mocks/gl2d_scatter-colorscale-colorbar.json
+++ b/test/image/mocks/gl2d_scatter-colorscale-colorbar.json
@@ -134,6 +134,15 @@
             ],
             "type": "scattergl",
             "mode": "markers"
+        },
+        {
+            "x": [20],
+            "y": [5.5],
+            "marker": {
+                "size": 20
+            },
+            "type": "scattergl",
+            "mode": "markers"
         }
     ],
     "layout": {
@@ -152,7 +161,7 @@
                 4,
                 6
             ],
-            "autorange": true
+            "autorange": false
         },
         "height": 598,
         "width": 1080,