diff --git a/R/AllClasses.R b/R/AllClasses.R
index 7c768e997e22b0b730f9473a70c9c7febb4f7a95..ac6cdc094f8027b1d2a36c0a87713a81cd383ac9 100644
--- a/R/AllClasses.R
+++ b/R/AllClasses.R
@@ -573,4 +573,5 @@ setClass("PhenoParams",
 setClass("ZINBParams",
          contains = "Params",
          slots = c(model = "ZinbModel"),
-         prototype = prototype(model = zinbwave::zinbModel()))
+         prototype = prototype(nGenes = 100, nCells = 50,
+                               model = zinbwave::zinbModel()))