diff --git a/eeschema/sch_symbol.cpp b/eeschema/sch_symbol.cpp
index 1be87fdd80..28c01c374c 100644
--- a/eeschema/sch_symbol.cpp
+++ b/eeschema/sch_symbol.cpp
@@ -1095,6 +1095,14 @@ void SCH_SYMBOL::SwapData( SCH_ITEM* aItem )
 
     std::swap( m_lib_id, symbol->m_lib_id );
 
+    m_pins.swap( symbol->m_pins );      // std::vector's swap()
+
+    for( std::unique_ptr<SCH_PIN>& pin : symbol->m_pins )
+        pin->SetParent( symbol );
+
+    for( std::unique_ptr<SCH_PIN>& pin : m_pins )
+        pin->SetParent( this );
+
     LIB_SYMBOL* libSymbol = symbol->m_part.release();
     symbol->m_part = std::move( m_part );
     symbol->UpdatePins();