diff --git a/gui/ecp5/mainwindow.cc b/gui/ecp5/mainwindow.cc
index 510b0201..efaad364 100644
--- a/gui/ecp5/mainwindow.cc
+++ b/gui/ecp5/mainwindow.cc
@@ -76,7 +76,7 @@ void MainWindow::createMenu() {
 
 static const ChipInfoPOD *get_chip_info(const RelPtr<ChipInfoPOD> *ptr) { return ptr->get(); }
 
-QStringList getSupportedPackages(ArchArgs::ArchArgsTypes chip)
+static QStringList getSupportedPackages(ArchArgs::ArchArgsTypes chip)
 {
     QStringList packages;
     const ChipInfoPOD *chip_info;
diff --git a/gui/ice40/mainwindow.cc b/gui/ice40/mainwindow.cc
index 3463e122..40b863e9 100644
--- a/gui/ice40/mainwindow.cc
+++ b/gui/ice40/mainwindow.cc
@@ -80,7 +80,7 @@ void MainWindow::createMenu()
 
 static const ChipInfoPOD *get_chip_info(const RelPtr<ChipInfoPOD> *ptr) { return ptr->get(); }
 
-QStringList getSupportedPackages(ArchArgs::ArchArgsTypes chip)
+static QStringList getSupportedPackages(ArchArgs::ArchArgsTypes chip)
 {
     QStringList packages;
     const ChipInfoPOD *chip_info;