diff --git a/period/cycles.py b/period/cycles.py
index 596ce39..6db2ce0 100644
--- a/period/cycles.py
+++ b/period/cycles.py
@@ -151,16 +151,15 @@ def cycle_math():
     for num, cycle in enumerate(all_cycles):
         # http://127.0.0.1:5000/cycle_math
         # cycle length = next start -  this start
-        if num > 0:
-            this_start = pendulum.parse(cycle['start_time'])
-            next_start = pendulum.parse(all_cycles[num-1]['start_time'])
-            cycle_length = (next_start - this_start).days
-            db.execute(
-                'UPDATE cycle SET cycle_length = ?'
-                ' WHERE id = ?',
-                (cycle_length, cycle['id'])
-            )
-            db.commit()
+        this_start = pendulum.parse(cycle['start_time'])
+        next_start = pendulum.parse(all_cycles[num-1]['start_time'])
+        cycle_length = (next_start - this_start).days
+        db.execute(
+            'UPDATE cycle SET cycle_length = ?'
+            ' WHERE id = ?',
+            (cycle_length, cycle['id'])
+        )
+        db.commit()
 
 
     return redirect(url_for('cycles.index'))
\ No newline at end of file