diff --git a/platform/util/src/com/intellij/util/ReflectionAssignabilityCache.java b/platform/util/src/com/intellij/util/ReflectionAssignabilityCache.java
index 0edd8c71db9e..fdebb9adfd8b 100644
--- a/platform/util/src/com/intellij/util/ReflectionAssignabilityCache.java
+++ b/platform/util/src/com/intellij/util/ReflectionAssignabilityCache.java
@@ -31,4 +31,7 @@ public class ReflectionAssignabilityCache {
     return ancestor == descendant || myCache.get(ancestor).get(descendant).booleanValue();
   }
 
+  public void clear() {
+    myCache.clear();
+  }
 }
diff --git a/xml/dom-impl/src/com/intellij/util/xml/impl/DomApplicationComponent.java b/xml/dom-impl/src/com/intellij/util/xml/impl/DomApplicationComponent.java
index 07ccb7b6198d..91867b9c2b93 100644
--- a/xml/dom-impl/src/com/intellij/util/xml/impl/DomApplicationComponent.java
+++ b/xml/dom-impl/src/com/intellij/util/xml/impl/DomApplicationComponent.java
@@ -81,6 +81,7 @@ public final class DomApplicationComponent {
     myTypeChooserManager.clearCache();
 
     myInvocationCaches.clear();
+    assignabilityCache.clear();
 
     registerDescriptions();
   }