diff --git a/pts/model/forecast.py b/pts/model/forecast.py
index 2a329be..1ca5dc6 100644
--- a/pts/model/forecast.py
+++ b/pts/model/forecast.py
@@ -249,7 +249,7 @@ class SampleForecast(Forecast):
         """
         Time length of the forecast.
         """
-        return self.samples.shape[-1]
+        return self.samples.shape[1]
 
     @property
     def mean(self):