diff --git a/api/config.go b/api/config.go
index 5d434d4..a4b0a04 100644
--- a/api/config.go
+++ b/api/config.go
@@ -36,5 +36,9 @@ func parseConfig() error {
 		}
 	}
 
+	if os.Getenv("CDN_PREFIX") == "" {
+		os.Setenv("CDN_PREFIX", os.Getenv("ORIGIN"))
+	}
+
 	return nil
 }