1 files changed, 7 insertions, 2 deletions

diff --git a/src/CommandOutput.h b/src/CommandOutput.h
index 6cba4de7f..cb40b05a6 100644
--- a/src/CommandOutput.h
+++ b/src/CommandOutput.h
@@ -17,9 +17,14 @@ class cCommandOutputCallback
 public:
 	virtual ~cCommandOutputCallback() {}  // Force a virtual destructor in subclasses
 
+	void vOut(const char * a_Fmt, fmt::printf_args);
+
 	/** Syntax sugar function, calls Out() with Printf()-ed parameters; appends a newline" */
-	void Out(const char * a_Fmt, fmt::ArgList);
-	FMT_VARIADIC(void, Out, const char *)
+	template <typename... Args>
+	void Out(const char * a_Fmt, const Args & ... a_Args)
+	{
+		vOut(a_Fmt, fmt::make_printf_args(a_Args...));
+	}
 
 	/** Called when the command wants to output anything; may be called multiple times */
 	virtual void Out(const AString & a_Text) = 0;