diff --git a/src/core/proteinxtp.cpp b/src/core/proteinxtp.cpp
index 5bd39545fdf54587c04a1281b6568ceb34597271..d18f3890e5f3c8394d29e6629a34ae9484cc8b59 100644
--- a/src/core/proteinxtp.cpp
+++ b/src/core/proteinxtp.cpp
@@ -75,6 +75,7 @@ ProteinXtp::ProteinXtp(const ProteinXtp& other):pappso::Protein(other)
     _is_contaminant=other._is_contaminant;
     _p_sequence_database = other._p_sequence_database;
     _p_fasta = other._p_fasta;
+    _dbxref_list = other._dbxref_list;
 }
 
 ProteinXtp::~ProteinXtp()