diff --git a/src/include/OpenImageIO/detail/fmt.h b/src/include/OpenImageIO/detail/fmt.h
index 3558152ae7..111b0d5b8e 100644
--- a/src/include/OpenImageIO/detail/fmt.h
+++ b/src/include/OpenImageIO/detail/fmt.h
@@ -14,11 +14,6 @@
 #    define FMT_HEADER_ONLY
 #endif
 
-// Disable fmt exceptions
-#ifndef FMT_EXCEPTIONS
-#    define FMT_EXCEPTIONS 0
-#endif
-
 #if OIIO_VERSION_LESS(3, 1, 2)
 /* DEPRECATED -- remove at next ABI compatibility boundary */
 OIIO_NAMESPACE_3_1_BEGIN
@@ -29,12 +24,6 @@ log_fmt_error(const char* message);
 OIIO_NAMESPACE_3_1_END
 #endif
 
-// Use the grisu fast floating point formatting for old fmt versions
-// (irrelevant for >= 7.1).
-#ifndef FMT_USE_GRISU
-#    define FMT_USE_GRISU 1
-#endif
-
 // fmt 8.1 stopped automatically enabling formatting of anything that supports
 // ostream output. This breaks a lot! Re-enable this old behavior.
 // NOTE: fmt 10.0 removed this support entirely.