diff --git a/scrape/scrape.go b/scrape/scrape.go
index 9a0ba1d009..29f98979bb 100644
--- a/scrape/scrape.go
+++ b/scrape/scrape.go
@@ -672,7 +672,7 @@ func acceptHeader(sps []config.ScrapeProtocol) string {
 		weight--
 	}
 	// Default match anything.
-	vals = append(vals, fmt.Sprintf("*/*;q=%d", weight))
+	vals = append(vals, fmt.Sprintf("*/*;q=0.%d", weight))
 	return strings.Join(vals, ",")
 }