diff --git a/test/upgrade/shell/executor.go b/test/upgrade/shell/executor.go
index d41ccc765a..020f0d3edd 100644
--- a/test/upgrade/shell/executor.go
+++ b/test/upgrade/shell/executor.go
@@ -185,7 +185,9 @@ func (w testingWriter) Write(p []byte) (n int, err error) {
 	// Strip trailing newline because t.Log always adds one.
 	p = bytes.TrimRight(p, "\n")
 
-	w.t.Logf("%s", p)
+	for _, line := range strings.Split(string(p), "\n") {
+		w.t.Logf(line)
+	}
 
 	return n, nil
 }