diff --git a/aoclib/output.py b/aoclib/output.py
index 8f0ea99..9f7363a 100644
--- a/aoclib/output.py
+++ b/aoclib/output.py
@@ -2,4 +2,4 @@ def printSolution(day, part, solution, test=False):
     if test:
         print("(TEST) ", end="")
 
-    print(f"Solution to day %s, part %s: %s" % (day, part, solution))
+    print("Solution to day %s, part %s: %s" % (day, part, solution))