diff --git a/coreutils/date.c b/coreutils/date.c
index a1a004d45..c73fb5be6 100644
--- a/coreutils/date.c
+++ b/coreutils/date.c
@@ -251,7 +251,7 @@ int date_main(int argc UNUSED_PARAM, char **argv)
 #if ENABLE_FEATURE_DATE_NANO
 		ts.tv_nsec = statbuf.st_mtim.tv_nsec;
 		/* Some toolchains use .st_mtimensec instead of st_mtim.tv_nsec.
-		 * If you need #define SVID_SOURCE 1 to enable st_mtim.tv_nsec,
+		 * If you need #define _SVID_SOURCE 1 to enable st_mtim.tv_nsec,
 		 * drop a mail to project mailing list please
 		 */
 #endif