diff --git a/app.py b/app.py
index 9abbf4d..c9b444d 100644
--- a/app.py
+++ b/app.py
@@ -311,7 +311,7 @@ def runoff(ballots):
     result = sorted(count.keys(), key=lambda i: count[i])
     log.debug("result of this round:")
     for r in result:
-        log.debug(r, count[r])
+        log.debug("%s %s", r, count[r])
     log.debug("striking %d", result[0])
     loser = candidates[result[0]]
     new_ballots = [