diff --git a/src/lib/fmt/SocketAddressFormatter.cxx b/src/lib/fmt/SocketAddressFormatter.cxx
index 048ea981f..43798c8cb 100644
--- a/src/lib/fmt/SocketAddressFormatter.cxx
+++ b/src/lib/fmt/SocketAddressFormatter.cxx
@@ -2,11 +2,19 @@
 // author: Max Kellermann <max.kellermann@gmail.com>
 
 #include "SocketAddressFormatter.hxx"
-#include "net/ToString.hxx"
+#include "net/FormatAddress.hxx"
 
 auto
 fmt::formatter<SocketAddress>::format(SocketAddress address, format_context &ctx) const
   -> format_context::iterator
 {
-	return formatter<string_view>::format(ToString(address), ctx);
+	char buffer[256];
+	std::string_view s;
+
+	if (ToString(std::span{buffer}, address))
+		s = buffer;
+	else
+		s = "?";
+
+	return formatter<string_view>::format(s, ctx);
 }