diff --git a/config.h.in b/config.h.in
index 8b1050b99e..4918e99899 100644
--- a/config.h.in
+++ b/config.h.in
@@ -127,7 +127,7 @@
 #cmakedefine HAVE_LDAP 1
 
 /* Define if you use SunLDAP */
-/#cmakedefine SUNLDAP 1
+#cmakedefine SUNLDAP 1
 
 /* Define to the full path of mozilla nss library */
 #define MOZILLA_NSS_LIB_DIR "@MOZILLA_NSS_LIB_DIR@"