diff --git a/compiler/frontend/src/org/jetbrains/jet/JetCoreEnvironment.java b/compiler/frontend/src/org/jetbrains/jet/JetCoreEnvironment.java
index 2e95dde30b3..eac28f341d6 100644
--- a/compiler/frontend/src/org/jetbrains/jet/JetCoreEnvironment.java
+++ b/compiler/frontend/src/org/jetbrains/jet/JetCoreEnvironment.java
@@ -12,6 +12,8 @@ public class JetCoreEnvironment extends JavaCoreEnvironment {
     public JetCoreEnvironment(Disposable parentDisposable) {
         super(parentDisposable);
         registerFileType(JetFileType.INSTANCE, "kt");
+        registerFileType(JetFileType.INSTANCE, "kts");
+        registerFileType(JetFileType.INSTANCE, "ktm");
         registerFileType(JetFileType.INSTANCE, "jet");
         registerParserDefinition(new JetParserDefinition());
     }
diff --git a/idea/src/org/jetbrains/jet/plugin/JetFileFactory.java b/idea/src/org/jetbrains/jet/plugin/JetFileFactory.java
index 709364f0666..ca9f73eb3b2 100644
--- a/idea/src/org/jetbrains/jet/plugin/JetFileFactory.java
+++ b/idea/src/org/jetbrains/jet/plugin/JetFileFactory.java
@@ -10,6 +10,6 @@ import org.jetbrains.annotations.NotNull;
 public class JetFileFactory extends FileTypeFactory {
     @Override
     public void createFileTypes(@NotNull FileTypeConsumer consumer) {
-        consumer.consume(JetFileType.INSTANCE, "jet;jetl;jets;kt");
+        consumer.consume(JetFileType.INSTANCE, "jet;jetl;jets;kt;kts;ktm");
     }
 }