diff --git a/runner/logger.go b/runner/logger.go
index ae2f3b1..45f4d61 100644
--- a/runner/logger.go
+++ b/runner/logger.go
@@ -35,7 +35,7 @@ func fatal(err error) {
 type appLogWriter struct{}
 
 func (a appLogWriter) Write(p []byte) (n int, err error) {
-	appLog(string(p))
+	appLog("%s", p)
 
 	return len(p), nil
 }