diff --git a/src/frontends/qt/CategorizedCombo.cpp b/src/frontends/qt/CategorizedCombo.cpp
index 43ce6cbdf7..ac4b45068f 100644
--- a/src/frontends/qt/CategorizedCombo.cpp
+++ b/src/frontends/qt/CategorizedCombo.cpp
@@ -287,11 +287,7 @@ void CategorizedCombo::Private::setFilter(QString const & s)
 		lastSel_ = filterModel_->mapToSource(filterModel_->index(sel, 0)).row();
 
 	filter_ = s;
-#if QT_VERSION < 0x060000
-	filterModel_->setFilterRegExp(charFilterRegExp(filter_));
-#else
 	filterModel_->setFilterRegularExpression(charFilterRegExp(filter_));
-#endif
 	countCategories();
 
 	// restore old selection
diff --git a/src/frontends/qt/LayoutBox.cpp b/src/frontends/qt/LayoutBox.cpp
index 573ec2784c..ab2cd7a085 100644
--- a/src/frontends/qt/LayoutBox.cpp
+++ b/src/frontends/qt/LayoutBox.cpp
@@ -320,11 +320,7 @@ void LayoutBox::Private::setFilter(QString const & s)
 		lastSel_ = filterModel_->mapToSource(filterModel_->index(sel, 0)).row();
 
 	filter_ = s;
-#if QT_VERSION < 0x060000
-	filterModel_->setFilterRegExp(charFilterRegExp(filter_));
-#else
 	filterModel_->setFilterRegularExpression(charFilterRegExp(filter_));
-#endif
 	countCategories();
 
 	// restore old selection