diff --git a/python/python-psi-impl/src/com/jetbrains/python/parsing/FunctionParsing.java b/python/python-psi-impl/src/com/jetbrains/python/parsing/FunctionParsing.java
index 1c1ad8b6a9b6..ec2249f694c1 100644
--- a/python/python-psi-impl/src/com/jetbrains/python/parsing/FunctionParsing.java
+++ b/python/python-psi-impl/src/com/jetbrains/python/parsing/FunctionParsing.java
@@ -273,7 +273,7 @@ public class FunctionParsing extends Parsing {
     }
   }
 
-  private void parseParameterSubList() {
+  protected void parseParameterSubList() {
     assertCurrentToken(PyTokenTypes.LPAR);
     final PsiBuilder.Marker tuple = myBuilder.mark();
     myBuilder.advanceLexer();