diff --git a/src/gluonts/model/forecast_generator.py b/src/gluonts/model/forecast_generator.py
index 06c372872c..ac33aae158 100644
--- a/src/gluonts/model/forecast_generator.py
+++ b/src/gluonts/model/forecast_generator.py
@@ -116,7 +116,7 @@ def __call__(
         for batch in inference_data_loader:
             inputs = select(input_names, batch, ignore_missing=True)
             (outputs,), loc, scale = prediction_net(*inputs.values())
-            outputs = to_numpy(output)
+            outputs = to_numpy(outputs)
             if scale is not None:
                 outputs = outputs * to_numpy(scale[..., None])
             if loc is not None: