diff --git a/src/lalr/GrammarSymbolSet.cpp b/src/lalr/GrammarSymbolSet.cpp
index 45a17a1..3601ea2 100644
--- a/src/lalr/GrammarSymbolSet.cpp
+++ b/src/lalr/GrammarSymbolSet.cpp
@@ -28,15 +28,15 @@ GrammarSymbolSet::GrammarSymbolSet( size_t symbols )
 
 GrammarSymbolSet::GrammarSymbolSet( GrammarSymbolSet&& set )
 : set_( std::move(set.set_) )
-, minimum_(numeric_limits<size_t>::max())
-, maximum_(numeric_limits<size_t>::min())
+, minimum_(set.minimum_)
+, maximum_(set.maximum_)
 {
 }
 
 GrammarSymbolSet::GrammarSymbolSet( const GrammarSymbolSet& set )
 : set_( set.set_ )
-, minimum_(numeric_limits<size_t>::max())
-, maximum_(numeric_limits<size_t>::min())
+, minimum_(set.minimum_)
+, maximum_(set.maximum_)
 {
 }