diff --git a/keyserver/internal/internal.go b/keyserver/internal/internal.go
index 330d2c2a0..a603323ef 100644
--- a/keyserver/internal/internal.go
+++ b/keyserver/internal/internal.go
@@ -515,7 +515,7 @@ func (a *KeyInternalAPI) uploadLocalDeviceKeys(ctx context.Context, req *api.Per
 func (a *KeyInternalAPI) uploadOneTimeKeys(ctx context.Context, req *api.PerformUploadKeysRequest, res *api.PerformUploadKeysResponse) {
 	if req.UserID == "" || req.DeviceID == "" {
 		res.Error = &api.KeyError{
-			Err: fmt.Sprintf("user ID or device ID missing")
+			Err: "user ID or device ID missing",
 		}
 	}
 	if len(req.OneTimeKeys) == 0 {