diff --git a/legrandchien.py b/legrandchien.py
index d355322..14236fb 100644
--- a/legrandchien.py
+++ b/legrandchien.py
@@ -496,7 +496,7 @@ class Equation:
         equations = list(equations)
 
         J_template = np.empty((n, n), dtype=object)
-        F_template = np.array((n, n), dtype=object)
+        F_template = np.empty(n, dtype=object)
         for i in range(n):
             f = equations[i]
             f.compile()