diff --git a/src/BiblioInfo.cpp b/src/BiblioInfo.cpp
index 420eaa2177..c031058aa3 100644
--- a/src/BiblioInfo.cpp
+++ b/src/BiblioInfo.cpp
@@ -830,6 +830,8 @@ vector<docstring> const BiblioInfo::getAuthorYearStrings(
 void BiblioInfo::mergeBiblioInfo(BiblioInfo const & info)
 {
 	bimap_.insert(info.begin(), info.end());
+	field_names_.insert(info.field_names_.begin(), info.field_names_.end());
+	entry_types_.insert(info.entry_types_.begin(), info.entry_types_.end());
 }