diff --git a/src/gui/proj/qgsprojectionselectiontreewidget.cpp b/src/gui/proj/qgsprojectionselectiontreewidget.cpp
index 121254c9de3d..9882bb8d5636 100644
--- a/src/gui/proj/qgsprojectionselectiontreewidget.cpp
+++ b/src/gui/proj/qgsprojectionselectiontreewidget.cpp
@@ -88,6 +88,8 @@ QgsProjectionSelectionTreeWidget::QgsProjectionSelectionTreeWidget( QWidget *par
   connect( leSearch, &QgsFilterLineEdit::textChanged, this, [=]( const QString &filter ) {
     mCrsModel->setFilterString( filter );
     mRecentCrsModel->setFilterString( filter );
+    if ( filter.length() >= 3 )
+      lstCoordinateSystems->expandAll();
   } );
 
   mAreaCanvas->setVisible( mShowMap );