diff --git a/e003.py b/e003.py
index ee18939..4ef4229 100644
--- a/e003.py
+++ b/e003.py
@@ -1,12 +1,12 @@
-def factor(n):
+def pfactor(n):
     i = 2
     while (n % i != 0 and i < n):
         i = i + 1
     if i == n:
         return [n]
-    p = factor(n // i)
+    p = pfactor(n // i)
     p.append(i)
     return sorted(p, reverse=True)
 
 print 'Prime factors of 600851475143:'
-print factor(600851475143)
+print pfactor(600851475143)