diff --git a/pymeeus/Moon.py b/pymeeus/Moon.py
index 48a2c34..b8d3e04 100644
--- a/pymeeus/Moon.py
+++ b/pymeeus/Moon.py
@@ -1208,7 +1208,7 @@ def moon_maximum_declination(epoch, target="northern"):
             jde += 2451562.5897
         else:
             D += 345.6676
-            M += 1.13951
+            M += 1.3951
             Mprime += 186.21
             F += 145.1633
             jde += 2451548.9289