diff --git a/avogadro/qtgui/insertfragmentdialog.cpp b/avogadro/qtgui/insertfragmentdialog.cpp
index 65c415d615..dfa0856c1a 100644
--- a/avogadro/qtgui/insertfragmentdialog.cpp
+++ b/avogadro/qtgui/insertfragmentdialog.cpp
@@ -212,8 +212,8 @@ void InsertFragmentDialog::filterTextChanged(const QString& newFilter)
     return; // no dialog or proxy model to set
 
   // Allow things like "ti" to match "Ti" etc.
-  QRegExp reg(newFilter, Qt::CaseInsensitive, QRegExp::WildcardUnix);
-  m_implementation->proxy->setFilterRegExp(reg);
+  QRegularExpression reg(newFilter, QRegularExpression::CaseInsensitiveOption);
+  m_implementation->proxy->setFilterRegularExpression(reg);
 
   if (!newFilter.isEmpty()) {
     // user interface niceness -- show any file match