diff --git a/platform/platform-api/src/com/intellij/openapi/actionSystem/MouseShortcut.java b/platform/platform-api/src/com/intellij/openapi/actionSystem/MouseShortcut.java
index 46e2e29313db..7727808bddfd 100644
--- a/platform/platform-api/src/com/intellij/openapi/actionSystem/MouseShortcut.java
+++ b/platform/platform-api/src/com/intellij/openapi/actionSystem/MouseShortcut.java
@@ -28,13 +28,6 @@ public final class MouseShortcut extends Shortcut {
   private final int myClickCount;
 
   public MouseShortcut(int button, int modifiers, int clickCount) {
-    if (
-      MouseEvent.BUTTON1 != button &&
-      MouseEvent.BUTTON2 != button &&
-      MouseEvent.BUTTON3 != button
-    ) {
-      throw new IllegalArgumentException("unknown button: " + button);
-    }
     myButton = button;
     // TODO[vova] check modifiers?
     myModifiers = mapOldModifiers(modifiers);
diff --git a/platform/platform-api/src/com/intellij/openapi/keymap/KeymapUtil.java b/platform/platform-api/src/com/intellij/openapi/keymap/KeymapUtil.java
index 2d4bc36787b7..e7214df6e2bf 100644
--- a/platform/platform-api/src/com/intellij/openapi/keymap/KeymapUtil.java
+++ b/platform/platform-api/src/com/intellij/openapi/keymap/KeymapUtil.java
@@ -128,7 +128,7 @@ public class KeymapUtil {
       // do nothing
     }
     else {
-      throw new IllegalStateException("unknown button: " + button);
+      buttonNum = button;
     }
 
     if (clickCount == 1) {
diff --git a/platform/platform-impl/src/com/intellij/openapi/keymap/impl/KeymapImpl.java b/platform/platform-impl/src/com/intellij/openapi/keymap/impl/KeymapImpl.java
index 04a680c6e65a..22a6260ca7fe 100644
--- a/platform/platform-impl/src/com/intellij/openapi/keymap/impl/KeymapImpl.java
+++ b/platform/platform-impl/src/com/intellij/openapi/keymap/impl/KeymapImpl.java
@@ -801,7 +801,7 @@ public class KeymapImpl implements Keymap, ExternalizableScheme {
       buffer.append(' ');
     }
     else {
-      throw new IllegalStateException("unknown button: " + button);
+      buffer.append("button").append(button);
     }
 
     if (shortcut.getClickCount() > 1) {