diff --git a/public/app/plugins/datasource/prometheus/querybuilder/components/PromQueryBuilderOptions.tsx b/public/app/plugins/datasource/prometheus/querybuilder/components/PromQueryBuilderOptions.tsx
index a071fe5230f..f2d8ab27671 100644
--- a/public/app/plugins/datasource/prometheus/querybuilder/components/PromQueryBuilderOptions.tsx
+++ b/public/app/plugins/datasource/prometheus/querybuilder/components/PromQueryBuilderOptions.tsx
@@ -127,7 +127,7 @@ function getCollapsedInfo(query: PromQuery, formatOption: string, queryType: str
 
   items.push(`Legend: ${getLegendModeLabel(query.legendFormat)}`);
   items.push(`Format: ${formatOption}`);
-  items.push(`Step ${query.interval}`);
+  items.push(`Step: ${query.interval ?? 'auto'}`);
   items.push(`Type: ${queryType}`);
 
   if (query.exemplar) {