diff --git a/compiler/cli/src/org/jetbrains/kotlin/cli/js/K2JSCompiler.java b/compiler/cli/src/org/jetbrains/kotlin/cli/js/K2JSCompiler.java
index cd9519c909e..e82405b7893 100644
--- a/compiler/cli/src/org/jetbrains/kotlin/cli/js/K2JSCompiler.java
+++ b/compiler/cli/src/org/jetbrains/kotlin/cli/js/K2JSCompiler.java
@@ -190,8 +190,8 @@ public class K2JSCompiler extends CLICompiler<K2JSCompilerArguments> {
         }
 
         File outputPostfixFile = null;
-        if (arguments.getOutputPrefix() != null) {
-            outputPostfixFile = new File(arguments.getOutputPrefix());
+        if (arguments.getOutputPostfix() != null) {
+            outputPostfixFile = new File(arguments.getOutputPostfix());
             if (!outputPostfixFile.exists()) {
                 messageCollector.report(ERROR, "Output postfix file '" + arguments.getOutputPostfix() + "' not found", null);
                 return ExitCode.COMPILATION_ERROR;