diff --git a/EGnStringUtils.h b/EGnStringUtils.h
index d2dcd61..8e815a1 100644
--- a/EGnStringUtils.h
+++ b/EGnStringUtils.h
@@ -103,7 +103,7 @@ IsValidDxfName( const std::string& sName)
 {
    if ( &sName == nullptr  ||  sName.empty())
       return false ;
-   return ( sName.find_first_of( " <>/\\\":;?*|='", 0) == std::string::npos) ;
+   return ( sName.find_first_of( " <>/\\\".:;?*|='", 0) == std::string::npos) ;
 }
 
 //----------------------------------------------------------------------------
@@ -111,7 +111,7 @@ inline bool
 ValidateDxfName( std::string& sName)
 {
    std::string::size_type i ;
-   while ( ( i = sName.find_first_of( " <>/\\\":;?*|='")) != std::string::npos)
+   while ( ( i = sName.find_first_of( " <>/\\\".:;?*|='")) != std::string::npos)
       sName[i] = '_' ;
    return true ;
 }