diff --git a/compiler/cli/src/org/jetbrains/jet/cli/js/K2JSCompiler.java b/compiler/cli/src/org/jetbrains/jet/cli/js/K2JSCompiler.java
index 44418e9fb9a..a8b71d9e984 100644
--- a/compiler/cli/src/org/jetbrains/jet/cli/js/K2JSCompiler.java
+++ b/compiler/cli/src/org/jetbrains/jet/cli/js/K2JSCompiler.java
@@ -65,21 +65,15 @@ public class K2JSCompiler extends CLICompiler<K2JSCompilerArguments, K2JSCompile
     @NotNull
     @Override
     protected ExitCode doExecute(K2JSCompilerArguments arguments, PrintingMessageCollector messageCollector, Disposable rootDisposable) {
-
-        if (arguments.srcdir == null && arguments.sourceFiles == null) {
-            messageCollector.report(CompilerMessageSeverity.ERROR, "Specify sources location via -srcdir", NO_LOCATION);
+        if (arguments.sourceFiles == null) {
+            messageCollector.report(CompilerMessageSeverity.ERROR, "Specify sources location via -sourceFiles", NO_LOCATION);
             return ExitCode.INTERNAL_ERROR;
         }
 
         JetCoreEnvironment environmentForJS = JetCoreEnvironment.getCoreEnvironmentForJS(rootDisposable);
 
-        if (arguments.srcdir != null) {
-            environmentForJS.addSources(arguments.srcdir);
-        }
-        if (arguments.sourceFiles != null) {
-            for (String sourceFile : arguments.sourceFiles) {
-                environmentForJS.addSources(sourceFile);
-            }
+        for (String sourceFile : arguments.sourceFiles) {
+            environmentForJS.addSources(sourceFile);
         }
 
         Project project = environmentForJS.getProject();
diff --git a/compiler/cli/src/org/jetbrains/jet/cli/js/K2JSCompilerArguments.java b/compiler/cli/src/org/jetbrains/jet/cli/js/K2JSCompilerArguments.java
index 98b55e36d17..47afaa99bd0 100644
--- a/compiler/cli/src/org/jetbrains/jet/cli/js/K2JSCompilerArguments.java
+++ b/compiler/cli/src/org/jetbrains/jet/cli/js/K2JSCompilerArguments.java
@@ -21,7 +21,6 @@ import org.jetbrains.jet.cli.common.CompilerArguments;
 import org.jetbrains.k2js.facade.MainCallParameters;
 
 import java.util.ArrayList;
-import java.util.List;
 
 /**
  * @author Pavel Talanov
@@ -29,7 +28,7 @@ import java.util.List;
 
 /**
  * NOTE: for now K2JSCompiler supports only minimal amount of parameters required to launch it from the plugin.
- * You can specify only one source folder, path to the file where generated file will be stored, path to zipped library sources.
+ * You can specify path to the file where generated file will be stored, path to zipped library sources.
  */
 public class K2JSCompilerArguments extends CompilerArguments {
     @Argument(value = "output", description = "Output file path")
@@ -39,8 +38,8 @@ public class K2JSCompilerArguments extends CompilerArguments {
     @Argument(value = "libraryFiles", description = "Path to zipped lib sources or kotlin files")
     public String[] libraryFiles;
 
-    @Argument(value = "srcdir", description = "Sources directory")
-    public String srcdir;
+    @Argument(value = "sourceFiles", description = "Source files (dir or file)")
+    public String[] sourceFiles;
 
     @Argument(value = "target", description = "Generate js files for specific ECMA version (3 or 5, default ECMA 3)")
     public String target;
@@ -60,8 +59,6 @@ public class K2JSCompilerArguments extends CompilerArguments {
     @Argument(value = "help", alias = "h", description = "Show help")
     public boolean help;
 
-    public List<String> sourceFiles;
-
     @Override
     public boolean isHelp() {
         return help;
@@ -84,10 +81,7 @@ public class K2JSCompilerArguments extends CompilerArguments {
 
     @Override
     public String getSrc() {
-        if (sourceFiles != null) {
-            return sourceFiles.toString();
-        }
-        return srcdir;
+        throw new IllegalStateException();
     }
 
     public MainCallParameters createMainCallParameters() {
diff --git a/idea/src/org/jetbrains/jet/plugin/compiler/K2JSCompiler.java b/idea/src/org/jetbrains/jet/plugin/compiler/K2JSCompiler.java
index 391e97e5908..bf4595c1f62 100644
--- a/idea/src/org/jetbrains/jet/plugin/compiler/K2JSCompiler.java
+++ b/idea/src/org/jetbrains/jet/plugin/compiler/K2JSCompiler.java
@@ -117,16 +117,9 @@ public final class K2JSCompiler implements TranslatingCompiler {
     @NotNull
     private static Integer doExec(@NotNull CompileContext context, @NotNull CompilerEnvironment environment, @NotNull PrintStream out,
             @NotNull Module module) throws Exception {
-        VirtualFile[] roots = ModuleRootManager.getInstance(module).getSourceRoots();
-        if (roots.length != 1) {
-            context.addMessage(CompilerMessageCategory.ERROR, "K2JSCompiler does not support multiple module source roots.", null, -1, -1);
-            return -1;
-        }
-
         VirtualFile outDir = context.getModuleOutputDirectory(module);
         String outFile = outDir == null ? null : outDir.getPath() + "/" + module.getName() + ".js";
-
-        String[] commandLineArgs = constructArguments(module, outFile, roots[0]);
+        String[] commandLineArgs = constructArguments(module, outFile);
         Object rc = invokeExecMethod(environment, out, context, commandLineArgs, "org.jetbrains.jet.cli.js.K2JSCompiler");
 
         if (outDir != null && !ApplicationManager.getApplication().isUnitTestMode()) {
@@ -136,15 +129,16 @@ public final class K2JSCompiler implements TranslatingCompiler {
     }
 
     @NotNull
-    private static String[] constructArguments(@NotNull Module module, @Nullable String outFile, @NotNull VirtualFile srcDir) {
+    private static String[] constructArguments(@NotNull Module module, @Nullable String outFile) {
         ArrayList<String> args = Lists.newArrayList("-tags", "-verbose", "-version", "-mainCall", "mainWithArgs");
-        addPathToSourcesDir(args, srcDir);
+        addPathToSourcesDir(module, args);
         addOutputPath(outFile, args);
         addLibLocationAndTarget(module, args);
         return ArrayUtil.toStringArray(args);
     }
 
     // we cannot use OrderEnumerator because it has critical bug — try https://gist.github.com/2953261, processor will never be called for module dependency
+    // we don't use context.getCompileScope().getAffectedModules() because we want to know about linkage type (well, we ignore scope right now, but in future...)
     private static void collectModuleDependencies(Module dependentModule, Set<Module> modules) {
         for (OrderEntry entry : ModuleRootManager.getInstance(dependentModule).getOrderEntries()) {
             if (entry instanceof ModuleOrderEntry) {
@@ -165,6 +159,11 @@ public final class K2JSCompiler implements TranslatingCompiler {
         }
     }
 
+    private static VirtualFile[] getSourceFiles(@NotNull Module module) {
+        return CompilerManager.getInstance(module.getProject()).createModuleCompileScope(module, false)
+                .getFiles(JetFileType.INSTANCE, true);
+    }
+
     private static void addLibLocationAndTarget(@NotNull Module module, @NotNull ArrayList<String> args) {
         Pair<String[], String> libLocationAndTarget = JsModuleDetector.getLibLocationAndTargetForProject(module);
 
@@ -176,9 +175,8 @@ public final class K2JSCompiler implements TranslatingCompiler {
             if (!modules.isEmpty()) {
                 for (Module dependency : modules) {
                     sb.append('@').append(dependency.getName()).append(',');
-                    VirtualFile[] files = CompilerManager.getInstance(module.getProject()).createModuleCompileScope(dependency, false)
-                            .getFiles(JetFileType.INSTANCE, true);
-                    for (VirtualFile file : files) {
+
+                    for (VirtualFile file : getSourceFiles(dependency)) {
                         sb.append(file.getPath()).append(',');
                     }
                 }
@@ -206,10 +204,19 @@ public final class K2JSCompiler implements TranslatingCompiler {
         }
     }
 
-    private static void addPathToSourcesDir(@NotNull ArrayList<String> args, @NotNull VirtualFile srcDir) {
-        String srcPath = srcDir.getPath();
-        args.add("-srcdir");
-        args.add(srcPath);
+    private static void addPathToSourcesDir(@NotNull Module module, @NotNull ArrayList<String> args) {
+        args.add("-sourceFiles");
+
+        StringBuilder sb = StringBuilderSpinAllocator.alloc();
+        try {
+            for (VirtualFile file : getSourceFiles(module)) {
+                sb.append(file.getPath()).append(',');
+            }
+            args.add(sb.substring(0, sb.length() - 1));
+        }
+        finally {
+            StringBuilderSpinAllocator.dispose(sb);
+        }
     }
 
     private static void addOutputPath(@Nullable String outFile, @NotNull ArrayList<String> args) {
diff --git a/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestSupport.java b/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestSupport.java
index 6c2f14ba2ad..1381212893f 100644
--- a/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestSupport.java
+++ b/js/js.tests/test/org/jetbrains/k2js/test/semantics/StdLibTestSupport.java
@@ -79,7 +79,7 @@ abstract class StdLibTestSupport extends SingleFileTranslationTest {
             K2JSCompiler compiler = new K2JSCompiler();
             K2JSCompilerArguments arguments = new K2JSCompilerArguments();
             arguments.outputFile = getOutputFilePath(getTestName(false) + ".compiler.kt", version);
-            arguments.sourceFiles = files;
+            arguments.sourceFiles = files.toArray(new String[files.size()]);
             arguments.verbose = true;
             System.out.println("Compiling with version: " + version + " to: " + arguments.outputFile);
             ExitCode answer = compiler.exec(System.out, arguments);