diff --git a/argocd/prometheus/test/argocd_values.yaml b/argocd/prometheus/test/argocd_values.yaml
index 0f0a668..1fada05 100644
--- a/argocd/prometheus/test/argocd_values.yaml
+++ b/argocd/prometheus/test/argocd_values.yaml
@@ -85,7 +85,7 @@ prometheus:
 
           # Default to scraping over https. If required, just disable this or change to
           # `http`.
-          scheme: http
+          scheme: https
 
           # This TLS & bearer token file config is used to connect to the actual scrape
           # endpoints for cluster components. This is separate to discovery auth