diff --git a/src/Logging.cpp b/src/Logging.cpp
index faec960..e17a132 100644
--- a/src/Logging.cpp
+++ b/src/Logging.cpp
@@ -43,8 +43,13 @@ void appendJsonEscaped(String &out, const char *text) {
 } // namespace
 
 void Log(const String &message) {
-	const String trimmed = message.substring(0, kLogLineLength - 1);
-	trimmed.toCharArray(g_logLines[g_logWritePos], kLogLineLength);
+	snprintf(
+		g_logLines[g_logWritePos],
+		kLogLineLength,
+		"[%010lu] %s",
+		static_cast<unsigned long>(millis()),
+		message.c_str()
+	);
 	g_logSeq[g_logWritePos] = g_nextLogSeq++;
 	g_logWritePos = (g_logWritePos + 1) % kLogCapacity;
 }