diff --git a/ChangeLog b/ChangeLog
index bc73870..4a062d2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -5,7 +5,7 @@ API Changes
 ChangeLog
 ========
  * closes #972: warning/error when XCache is loaded incorrectly
- * closes #73: warn for improper PHP_FCGI_CHILDREN setting fcgi mode
+ * closes #73: warn for improper PHP_FCGI_CHILDREN setting fcgi mode (>=PHP_5_3)
  * closes #174: updated api for clear all cache
 
 2.0.1 2012-07-14
diff --git a/xcache.c b/xcache.c
index 6779d55..c957e48 100644
--- a/xcache.c
+++ b/xcache.c
@@ -3870,11 +3870,14 @@ static PHP_MINIT_FUNCTION(xcache)
 #endif
 	REGISTER_INI_ENTRIES();
 
+	/* additional_functions requires PHP 5.3. TODO: find simpler way to do it */
+#ifdef ZEND_ENGINE_2_3
 	if (strcmp(sapi_module.name, "cgi-fcgi") == 0 && !sapi_module.additional_functions && !getenv("XCACHE_SKIP_FCGI_WARNING") && !getenv("GATEWAY_INTERFACE")) {
 		if ((getenv("PHP_FCGI_CHILDREN") == NULL) || (atoi(getenv("PHP_FCGI_CHILDREN")) < 1)) {
 			zend_error(E_WARNING, "PHP_FCGI_CHILDREN should be >= 1 and use 1 group of parent/childs model. Set XCACHE_SKIP_FCGI_WARNING=1 to skip this warning. See " XCACHE_WIKI_URL "/Faq");
 		}
 	}
+#endif
 
 	xc_config_long(&xc_php_size,       "xcache.size",        "0");
 	xc_config_hash(&xc_php_hcache,     "xcache.count",       "1");