diff --git a/GaudiKernel/src/Lib/Stat.cpp b/GaudiKernel/src/Lib/Stat.cpp
index 2227e20fd8b474ff2a407079d893073749028343..fff1734fc9ce3298dce3604016adf4a795e64df5 100644
--- a/GaudiKernel/src/Lib/Stat.cpp
+++ b/GaudiKernel/src/Lib/Stat.cpp
@@ -21,6 +21,12 @@
  *  @date 2005-08-02
  *  @date 2007-07-08
  */
+
+#if FMT_VERSION >= 90000
+template <>
+struct fmt::formatter<StatEntity> : fmt::ostream_formatter {};
+#endif
+
 // ============================================================================
 /*   Constructor from IStatSvc,tag and value
  *