diff --git a/pendulum/datetime.py b/pendulum/datetime.py
index abca24a8..6c423037 100644
--- a/pendulum/datetime.py
+++ b/pendulum/datetime.py
@@ -1256,11 +1256,11 @@ def _nth_of_month(self, nth, day_of_week):
             return self.first_of("month", day_of_week)
 
         dt = self.first_of("month")
-        check = dt.format("%Y-%m")
+        check = dt.format("%Y-%M")
         for i in range(nth - (1 if dt.day_of_week == day_of_week else 0)):
             dt = dt.next(day_of_week)
 
-        if dt.format("%Y-%m") == check:
+        if dt.format("%Y-%M") == check:
             return self.set(day=dt.day).start_of("day")
 
         return False
diff --git a/tests/date/test_day_of_week_modifiers.py b/tests/date/test_day_of_week_modifiers.py
index 0b12a98f..e65a13c0 100644
--- a/tests/date/test_day_of_week_modifiers.py
+++ b/tests/date/test_day_of_week_modifiers.py
@@ -111,7 +111,7 @@ def test_last_friday_of_month():
 
 
 def test_nth_of_month_outside_scope():
-    d = pendulum.date(1975, 12, 5)
+    d = pendulum.date(1975, 6, 5)
 
     with pytest.raises(PendulumException):
         d.nth_of("month", 6, pendulum.MONDAY)
diff --git a/tests/datetime/test_day_of_week_modifiers.py b/tests/datetime/test_day_of_week_modifiers.py
index a1091022..7b476418 100644
--- a/tests/datetime/test_day_of_week_modifiers.py
+++ b/tests/datetime/test_day_of_week_modifiers.py
@@ -127,7 +127,7 @@ def test_last_friday_of_month():
 
 
 def test_nth_of_month_outside_scope():
-    d = pendulum.datetime(1975, 12, 5)
+    d = pendulum.datetime(1975, 6, 5)
 
     with pytest.raises(PendulumException):
         d.nth_of("month", 6, pendulum.MONDAY)