diff --git a/public/app/plugins/panel/timeseries/utils.test.ts b/public/app/plugins/panel/timeseries/utils.test.ts
index 25239a24685..2eb3ca95674 100644
--- a/public/app/plugins/panel/timeseries/utils.test.ts
+++ b/public/app/plugins/panel/timeseries/utils.test.ts
@@ -100,6 +100,8 @@ describe('prepare timeseries graph', () => {
         3,
       ]
     `);
+
+    expect(frames![0].length).toEqual(6);
   });
 
   it('will insert and convert nulls to a configure "no value" value', () => {
@@ -122,5 +124,6 @@ describe('prepare timeseries graph', () => {
         3,
       ]
     `);
+    expect(frames![0].length).toEqual(6);
   });
 });
diff --git a/public/app/plugins/panel/timeseries/utils.ts b/public/app/plugins/panel/timeseries/utils.ts
index 9d720a321ba..4ec50963908 100644
--- a/public/app/plugins/panel/timeseries/utils.ts
+++ b/public/app/plugins/panel/timeseries/utils.ts
@@ -104,6 +104,7 @@ export function prepareGraphableFields(
     if (hasTimeField && hasValueField) {
       frames.push({
         ...frame,
+        length: nulledFrame.length,
         fields,
       });
     }