diff --git a/platform/util/src/com/intellij/openapi/util/Key.java b/platform/util/src/com/intellij/openapi/util/Key.java
index c3867ddb18bd..f882e6c41731 100644
--- a/platform/util/src/com/intellij/openapi/util/Key.java
+++ b/platform/util/src/com/intellij/openapi/util/Key.java
@@ -64,4 +64,10 @@ public class Key<T> {
   public boolean containsIn(@Nullable UserDataHolder holder) {
     return get(holder) != null;
   }
-}
+
+  public void set(@Nullable UserDataHolder holder, T value) {
+    if (holder != null) {
+      holder.putUserData(this, value);
+    }
+  }
+}
\ No newline at end of file