diff --git a/libfwupd/fwupd-client.c b/libfwupd/fwupd-client.c
index 9db14a3cc..35904db1c 100644
--- a/libfwupd/fwupd-client.c
+++ b/libfwupd/fwupd-client.c
@@ -2720,7 +2720,7 @@ fwupd_client_upload_bytes (FwupdClient *self,
 		return NULL;
 
 	/* build message */
-	if ((flags | FWUPD_CLIENT_UPLOAD_FLAG_ALWAYS_MULTIPART) > 0 ||
+	if ((flags & FWUPD_CLIENT_UPLOAD_FLAG_ALWAYS_MULTIPART) > 0 ||
 	    signature != NULL) {
 		g_autoptr(SoupMultipart) mp = NULL;
 		mp = soup_multipart_new (SOUP_FORM_MIME_TYPE_MULTIPART);