diff --git a/eeschema/symbol_viewer_frame.cpp b/eeschema/symbol_viewer_frame.cpp
index a2f7e2752f..fd289839e4 100644
--- a/eeschema/symbol_viewer_frame.cpp
+++ b/eeschema/symbol_viewer_frame.cpp
@@ -884,8 +884,8 @@ void SYMBOL_VIEWER_FRAME::ClickOnLibList( wxCommandEvent& event )
 void SYMBOL_VIEWER_FRAME::SetSelectedLibrary( const wxString& aLibraryName,
                                               const wxString& aSubLibName )
 {
-    if( m_currentSymbol.GetUniStringLibNickname() == aLibraryName &&
-        wxString( m_currentSymbol.GetSubLibraryName() ) == aSubLibName )
+    if( m_currentSymbol.GetUniStringLibNickname() == aLibraryName
+        && m_currentSymbol.GetSubLibraryName().wx_str() == aSubLibName )
         return;
 
     m_currentSymbol.SetLibNickname( aLibraryName );