X-Git-Url: http://git.alex.org.uk

diff --git a/configure.ac b/configure.ac
index 72f0148..dd2cc28 100644
--- a/configure.ac
+++ b/configure.ac
@@ -82,7 +82,7 @@ AC_ARG_ENABLE(
   ]
 )
 
-AC_PROG_CC
+AC_PROG_CC_C99
 AC_PROG_CPP
 AC_PROG_INSTALL
 AC_CANONICAL_HOST