diff --git a/lib/libc/gen/sysconf.c b/lib/libc/gen/sysconf.c
index 9d4bce506326..e62c53f8de19 100644
--- a/lib/libc/gen/sysconf.c
+++ b/lib/libc/gen/sysconf.c
@@ -224,10 +224,6 @@ sysconf(name)
 		mib[0] = CTL_P1003_1B;
 		mib[1] = CTL_P1003_1B_SEMAPHORES;
 		goto yesno;
-	case _SC_FSYNC:
-		mib[0] = CTL_P1003_1B;
-		mib[1] = CTL_P1003_1B_FSYNC;
-		goto yesno;
 	case _SC_SHARED_MEMORY_OBJECTS:
 		mib[0] = CTL_P1003_1B;
 		mib[1] = CTL_P1003_1B_SHARED_MEMORY_OBJECTS;
@@ -287,6 +283,9 @@ sysconf(name)
 		goto yesno;
 #endif /* _P1003_1B_VISIBLE */
 
+	case _SC_FSYNC:
+		return (_POSIX_FSYNC);
+
 #if defined(_SC_NPROCESSORS_CONF) && defined(_SC_NPROCESSORS_ONLN)
 	case _SC_NPROCESSORS_CONF:
 	case _SC_NPROCESSORS_ONLN: