diff --git a/gtk2_ardour/open_file_dialog_proxy.h b/gtk2_ardour/open_file_dialog_proxy.h
index 15d631e252..06e6034339 100644
--- a/gtk2_ardour/open_file_dialog_proxy.h
+++ b/gtk2_ardour/open_file_dialog_proxy.h
@@ -27,7 +27,7 @@ namespace ARDOUR
 {
         std::string save_file_dialog (std::string initial_path = "", std::string title = _("Save"));
         std::string open_file_dialog (std::string initial_path = "", std::string title = _("Open"));
-        std::vector<std::string> open_file_dialog (std::vector<std::string> extantions, std::string initial_path = "", std::string title = _("Open"));
+        std::vector<std::string> open_file_dialog (std::vector<std::string> extensions, std::string initial_path = "", std::string title = _("Open"));
         std::string choose_folder_dialog (std::string initial_path = "", std::string title = _("Choose Folder"));
 }