diff --git a/test/test_grad.py b/test/test_grad.py
index 02e9859..4172ede 100644
--- a/test/test_grad.py
+++ b/test/test_grad.py
@@ -81,7 +81,7 @@ def format_func(value, tick_number):
     plt.savefig('test_grad.png')
 if __name__ == '__main__':
     b=0.1 
-    t_0 = 8280; t_E=40; alphadeg = 60.
+    t_0 = 8280.; t_E=40.; alphadeg = 60.
     q = 0.2; s = 0.9; rho = 10**(-2)
     tol=1e-3
     retol = 1e-3