diff --git a/eeschema/lib_symbol.cpp b/eeschema/lib_symbol.cpp
index 9dfa858af9..ddaadd27a1 100644
--- a/eeschema/lib_symbol.cpp
+++ b/eeschema/lib_symbol.cpp
@@ -669,6 +669,7 @@ std::unique_ptr< LIB_SYMBOL > LIB_SYMBOL::Flatten() const
         retv->SetExcludedFromBoard( parent->GetExcludedFromBoard() );
 
         retv->UpdateFieldOrdinals();
+        retv->m_parent.reset();
     }
     else
     {