diff --git a/src/DarkNews/model.py b/src/DarkNews/model.py
index 631dc65..4b0e99e 100755
--- a/src/DarkNews/model.py
+++ b/src/DarkNews/model.py
@@ -480,7 +480,7 @@ def set_vertices(self):
 
         # Mixing matrices
         # if PMNS, use dtype=complex
-        self.Ulep = np.diag(np.full_like(self.Ue, np.float128(1)))
+        self.Ulep = np.diag(np.full_like(self.Ue, np.longdouble(1)))
         # self.Ulep = np.diag(np.full(self.n_nus,1,dtype=complex))
         # self.Ulep[:3,:3] = const.UPMNS # massless light neutrinos