diff --git a/napier/src/androidMain/kotlin/io/github/aakira/napier/DebugAntilog.kt b/napier/src/androidMain/kotlin/io/github/aakira/napier/DebugAntilog.kt
index e4d5f7e..ba6660b 100644
--- a/napier/src/androidMain/kotlin/io/github/aakira/napier/DebugAntilog.kt
+++ b/napier/src/androidMain/kotlin/io/github/aakira/napier/DebugAntilog.kt
@@ -68,7 +68,7 @@ actual class DebugAntilog actual constructor(private val defaultTag: String) : A
     private fun performTag(tag: String): String {
         val thread = Thread.currentThread().stackTrace
 
-        return if (thread.size >= CALL_STACK_INDEX) {
+        return if (thread.size > CALL_STACK_INDEX) {
             thread[CALL_STACK_INDEX].run {
                 "${createStackElementTag(className)}\$$methodName"
             }
diff --git a/napier/src/darwinMain/kotlin/io/github/aakira/napier/DebugAntilog.kt b/napier/src/darwinMain/kotlin/io/github/aakira/napier/DebugAntilog.kt
index a56bb5a..fb9a456 100644
--- a/napier/src/darwinMain/kotlin/io/github/aakira/napier/DebugAntilog.kt
+++ b/napier/src/darwinMain/kotlin/io/github/aakira/napier/DebugAntilog.kt
@@ -62,7 +62,7 @@ actual class DebugAntilog(
     // find stack trace
     private fun performTag(tag: String): String {
         val symbols = NSThread.callStackSymbols
-        if (symbols.size <= CALL_STACK_INDEX) return tag
+        if (symbols.lastIndex <= CALL_STACK_INDEX) return tag
 
         return (symbols[CALL_STACK_INDEX] as? String)?.let {
             createStackElementTag(it)
diff --git a/napier/src/jvmMain/kotlin/io/github/aakira/napier/DebugAntilog.kt b/napier/src/jvmMain/kotlin/io/github/aakira/napier/DebugAntilog.kt
index 9232023..a22d364 100644
--- a/napier/src/jvmMain/kotlin/io/github/aakira/napier/DebugAntilog.kt
+++ b/napier/src/jvmMain/kotlin/io/github/aakira/napier/DebugAntilog.kt
@@ -77,7 +77,7 @@ actual class DebugAntilog(
     private fun performTag(defaultTag: String): String {
         val thread = Thread.currentThread().stackTrace
 
-        return if (thread.size >= CALL_STACK_INDEX) {
+        return if (thread.size > CALL_STACK_INDEX) {
             thread[CALL_STACK_INDEX].run {
                 "${createStackElementTag(className)}\$$methodName"
             }