diff --git a/java/java-psi-impl/src/com/intellij/psi/impl/source/tree/java/MethodElement.java b/java/java-psi-impl/src/com/intellij/psi/impl/source/tree/java/MethodElement.java
index 1edd7cbaec76..5398f47a39d8 100644
--- a/java/java-psi-impl/src/com/intellij/psi/impl/source/tree/java/MethodElement.java
+++ b/java/java-psi-impl/src/com/intellij/psi/impl/source/tree/java/MethodElement.java
@@ -75,6 +75,9 @@ public class MethodElement extends CompositeElement implements Constants {
       LeafElement semicolon = Factory.createSingleLeafElement(SEMICOLON, ";", 0, 1, treeCharTab, getManager());
       addInternal(semicolon, semicolon, null, Boolean.TRUE);
     }
+    else if (child.getElementType() == PARAMETER_LIST) {
+      throw new IllegalArgumentException("Deleting parameter list is prohibited");
+    }
     else {
       super.deleteChildInternal(child);
     }