diff --git a/src/commonMain/kotlin/KSLogTypealiases.kt b/src/commonMain/kotlin/KSLogTypealiases.kt
index 1a8fb1d..0e2b5c8 100644
--- a/src/commonMain/kotlin/KSLogTypealiases.kt
+++ b/src/commonMain/kotlin/KSLogTypealiases.kt
@@ -1,8 +1,8 @@
 package dev.inmo.kslog.common
 
-typealias MessageFormatter = (l: LogLevel, t: String, m: Any, Throwable?) -> String
+typealias MessageFormatter = (l: LogLevel, t: String?, m: Any, Throwable?) -> String
 @Suppress("NOTHING_TO_INLINE")
 inline fun MessageFormatter(noinline formatter: MessageFormatter) = formatter
 typealias MessageFilter = (l: LogLevel, t: String?, Throwable?) -> Boolean
-val defaultMessageFormatter: MessageFormatter = { l, t, m, _ -> "[$l] $t - $m" }
+val defaultMessageFormatter: MessageFormatter = { l, t, m, _ -> "[$l] ${t ?.let { "$it " } ?: ""}- $m" }