diff --git a/src/libs/3rdparty/cplusplus/Symbol.cpp b/src/libs/3rdparty/cplusplus/Symbol.cpp
index b7caa001c96..b6216f002c8 100644
--- a/src/libs/3rdparty/cplusplus/Symbol.cpp
+++ b/src/libs/3rdparty/cplusplus/Symbol.cpp
@@ -237,6 +237,11 @@ void Symbol::setScope(Scope *scope)
     _scope = scope;
 }
 
+void Symbol::resetScope()
+{
+    _scope = 0;
+}
+
 Namespace *Symbol::enclosingNamespace() const
 {
     for (Scope *s = _scope; s; s = s->enclosingScope()) {
diff --git a/src/libs/3rdparty/cplusplus/Symbol.h b/src/libs/3rdparty/cplusplus/Symbol.h
index 34231207456..a995f436312 100644
--- a/src/libs/3rdparty/cplusplus/Symbol.h
+++ b/src/libs/3rdparty/cplusplus/Symbol.h
@@ -291,6 +291,7 @@ public:
     Block *enclosingBlock() const;
 
     void setScope(Scope *enclosingScope); // ### make me private
+    void resetScope(); // ### make me private
     void setSourceLocation(unsigned sourceLocation, TranslationUnit *translationUnit); // ### make me private
 
     void visitSymbol(SymbolVisitor *visitor);
diff --git a/src/libs/cplusplus/CppRewriter.cpp b/src/libs/cplusplus/CppRewriter.cpp
index ba975b3cd13..8948b9297ef 100644
--- a/src/libs/cplusplus/CppRewriter.cpp
+++ b/src/libs/cplusplus/CppRewriter.cpp
@@ -151,6 +151,9 @@ public:
                 newArg->setName(rewrite->rewriteName(arg->name()));
                 newArg->setType(rewrite->rewriteType(arg->type()));
 
+                // the copy() call above set the scope to 'type'
+                // reset it to 0 before adding addMember to avoid assert
+                newArg->resetScope();
                 funTy->addMember(newArg);
             }