diff --git a/receiver/prometheusreceiver/internal/staleness_end_to_end_test.go b/receiver/prometheusreceiver/internal/staleness_end_to_end_test.go
index f842383c0403..042efed87db6 100644
--- a/receiver/prometheusreceiver/internal/staleness_end_to_end_test.go
+++ b/receiver/prometheusreceiver/internal/staleness_end_to_end_test.go
@@ -111,6 +111,7 @@ receivers:
           scrape_interval: 100ms
           static_configs:
             - targets: [%q]
+			  fallback_scrape_protocol: PrometheusText1.0.0
 
 processors:
   batch: