diff --git a/src/jsMain/kotlin/ExtendedConsole.kt b/src/jsMain/kotlin/ExtendedConsole.kt
index e486dc6..25864c7 100644
--- a/src/jsMain/kotlin/ExtendedConsole.kt
+++ b/src/jsMain/kotlin/ExtendedConsole.kt
@@ -5,7 +5,7 @@ import kotlin.js.Console
 external interface ExtendedConsole : Console {
     fun trace()
     fun debug(vararg o: Any?)
-    fun assert(vararg o: Any?)
+    fun assert(assertion: Boolean, vararg o: Any?)
 }
 
 /**
@@ -16,7 +16,7 @@ fun Console.debug(vararg args: Any?) = unsafeCast<ExtendedConsole>().debug(*args
 /**
  * [https://developer.mozilla.org/en-US/docs/Web/APtraceI/console/assert_static](https://developer.mozilla.org/en-US/docs/Web/API/console/assert_static)
  */
-fun Console.assert(vararg args: Any?) = unsafeCast<ExtendedConsole>().assert(*args)
+fun Console.assert(assertion: Boolean, vararg args: Any?) = unsafeCast<ExtendedConsole>().assert(assertion, *args)
 
 /**
  * [https://developer.mozilla.org/en-US/docs/Web/API/console/trace_static](https://developer.mozilla.org/en-US/docs/Web/API/console/trace_static)
diff --git a/src/jsMain/kotlin/KSLoggerDefaultPlatformLoggerLambda.kt b/src/jsMain/kotlin/KSLoggerDefaultPlatformLoggerLambda.kt
index 3ae1d03..e6fac74 100644
--- a/src/jsMain/kotlin/KSLoggerDefaultPlatformLoggerLambda.kt
+++ b/src/jsMain/kotlin/KSLoggerDefaultPlatformLoggerLambda.kt
@@ -14,6 +14,6 @@ actual var KSLoggerDefaultPlatformLoggerLambda: (level: LogLevel, tag: String, m
         LogLevel.INFO -> console.info(*args)
         LogLevel.WARNING -> console.warn(*args)
         LogLevel.ERROR -> console.error(*args)
-        LogLevel.ASSERT -> console.assert(*args)
+        LogLevel.ASSERT -> console.error(*args)
     }
 }
\ No newline at end of file