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-rw-r--r--src/emu/ui/ui.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/emu/ui/ui.h b/src/emu/ui/ui.h
index 3d2400b08ff..1e7751e8118 100644
--- a/src/emu/ui/ui.h
+++ b/src/emu/ui/ui.h
@@ -247,7 +247,7 @@ int get_font_rows(running_machine *machine = nullptr);
//-------------------------------------------------
template <typename Format, typename... Params>
-void ui_manager::popup_time(int seconds, Format &&fmt, Params &&... args)
+inline void ui_manager::popup_time(int seconds, Format &&fmt, Params &&... args)
{
// extract the text
messagebox_poptext = string_format(std::forward<Format>(fmt), std::forward<Params>(args)...);