diff --git a/project_euler/problem_044/sol1.py b/project_euler/problem_044/sol1.py
index d3ae6476d45f..3b75b6a56a8e 100644
--- a/project_euler/problem_044/sol1.py
+++ b/project_euler/problem_044/sol1.py
@@ -42,6 +42,8 @@ def solution(limit: int = 5000) -> int:
             if is_pentagonal(a) and is_pentagonal(b):
                 return b
 
+    return -1
+
 
 if __name__ == "__main__":
     print(f"{solution() = }")