diff --git a/pkg/rtc/dynacast/dynacastmanager.go b/pkg/rtc/dynacast/dynacastmanager.go
index 4efe1c462..a8dc438ed 100644
--- a/pkg/rtc/dynacast/dynacastmanager.go
+++ b/pkg/rtc/dynacast/dynacastmanager.go
@@ -163,6 +163,9 @@ func (d *DynacastManager) getOrCreateDynacastQuality(mime string) *DynacastQuali
 
 	normalizedMime := strings.ToLower(mime)
 	if dq := d.dynacastQuality[normalizedMime]; dq != nil {
+		if normalizedMime != mime {
+			d.mimeCases[normalizedMime] = mime
+		}
 		return dq
 	}