diff --git a/configure.ac b/configure.ac | |
index 09ee123..b7b5908 100644 | |
--- a/configure.ac | |
+++ b/configure.ac | |
@@ -7,8 +7,8 @@ m4_ifdef([AC_USE_SYSTEM_EXTENSIONS], | |
[AC_USE_SYSTEM_EXTENSIONS], | |
[AC_GNU_SOURCE]) | |
-AC_PROG_CC_C89 | |
-for flag in -std=c89 -Wall -Wextra; do | |
+AC_PROG_CC_C99 | |
+for flag in -Wall -Wextra; do | |
AC_TRY_COMPILE([], [return 0;], [CFLAGS="$CFLAGS $flag"],) | |
done | |