diff --git a/include/sta/Format.hh b/include/sta/Format.hh
index 1745f482..88555a1e 100644
--- a/include/sta/Format.hh
+++ b/include/sta/Format.hh
@@ -35,10 +35,7 @@
 #include <zlib.h>
 #endif
 
-// std::format is not supported in GCC 11 (e.g. Ubuntu 22.04).
-// Use fmt library as fallback when __cpp_lib_format is not defined.
-
-#if defined(__cpp_lib_format) && __cpp_lib_format >= 201907L
+#if HAVE_CXX_STD_FORMAT
 #include <format>
 
 namespace sta {
diff --git a/util/StaConfig.hh.cmake b/util/StaConfig.hh.cmake
index 2efd9720..daf90b36 100644
--- a/util/StaConfig.hh.cmake
+++ b/util/StaConfig.hh.cmake
@@ -6,4 +6,6 @@
 
 #cmakedefine ZLIB_FOUND
 
+#cmakedefine01 HAVE_CXX_STD_FORMAT
+
 #define TCL_READLINE ${TCL_READLINE}