1 files changed, 1 insertions, 1 deletions

diff --git a/m4/mod_ssl.m4 b/m4/mod_ssl.m4
index 457548e..6a852b9 100644
--- a/m4/mod_ssl.m4
+++ b/m4/mod_ssl.m4
@@ -15,7 +15,7 @@ AC_ARG_WITH(
                 ssl_incdir="$withval",
         )
 
-        if test "$ssl_val" = "yes"; then
+        if test "x$ssl_val" = "xyes"; then
                 ac_save_CFLAGS=$CFLAGS
                 ac_save_CPPFLAGS=$CPPFLAGS
                 MOD_SSL_CFLAGS="-I/usr/include/openssl"