diff --git a/compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JsIrCompiler.kt b/compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JsIrCompiler.kt
index b8072a7f8db..65a2842aa0a 100644
--- a/compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JsIrCompiler.kt
+++ b/compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JsIrCompiler.kt
@@ -376,6 +376,13 @@ class K2JsIrCompiler : CLICompiler<K2JSCompilerArguments>() {
                 )
 
                 return OK
+            } else {
+                if (arguments.irDceDumpReachabilityInfoToFile != null) {
+                    messageCollector.report(STRONG_WARNING, "Dumping the reachability info to file is supported only for Kotlin/Wasm.")
+                }
+                if (arguments.irDceDumpDeclarationIrSizesToFile != null) {
+                    messageCollector.report(STRONG_WARNING, "Dumping the size of declarations to file is supported only for Kotlin/Wasm.")
+                }
             }
 
             val start = System.currentTimeMillis()