diff --git a/project_euler/problem_034/sol1.py b/project_euler/problem_034/sol1.py
index 8d8432dbbb7a..50453387429c 100644
--- a/project_euler/problem_034/sol1.py
+++ b/project_euler/problem_034/sol1.py
@@ -8,7 +8,7 @@
 
 from math import factorial
 
-DIGIT_FACTORIAL = {str(d): factorial(d) for d in range(10)}
+DIGIT_FACTORIAL = [factorial(d) for d in range(10)]
 
 
 def sum_of_digit_factorial(n: int) -> int:
@@ -19,7 +19,11 @@ def sum_of_digit_factorial(n: int) -> int:
     >>> sum_of_digit_factorial(0)
     1
     """
-    return sum(DIGIT_FACTORIAL[d] for d in str(n))
+    s = 0
+    while n != 0:
+        s += DIGIT_FACTORIAL[n % 10]
+        n //= 10
+    return s
 
 
 def solution() -> int: