diff --git a/.gitignore b/.gitignore
index 56fb6c78d2..1027fc4ff3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -134,6 +134,7 @@ dmypy.json
 
 # tmp files
 tmp/
+tmp.npy
 
 # Mac
 .DS_Store
diff --git a/src/qibo/result.py b/src/qibo/result.py
index 007fb2ea36..39babb81f3 100644
--- a/src/qibo/result.py
+++ b/src/qibo/result.py
@@ -68,7 +68,7 @@ def state(self, numpy: bool = False):
         """State's tensor representation as a backend tensor.
 
         Args:
-            numpy (bool, optional): If ``True`` the returned tensor will be a numpy array,
+            numpy (bool, optional): If ``True`` the returned tensor will be a ``numpy`` array,
                 otherwise it will follow the backend tensor type.
                 Defaults to ``False``.
 
@@ -76,7 +76,8 @@ def state(self, numpy: bool = False):
             The state in the computational basis.
         """
         if numpy:
-            return np.array(self._state)
+            return np.array(self._state.tolist())
+
         return self._state
 
     def probabilities(self, qubits: Optional[Union[list, set]] = None):