diff --git a/ext/session/php_session.h b/ext/session/php_session.h
index 1e275f1cf8c..f79d17e700b 100644
--- a/ext/session/php_session.h
+++ b/ext/session/php_session.h
@@ -169,8 +169,6 @@ PHPAPI void php_session_set_id(char *id TSRMLS_DC);
 #define PS_DEL_VARL(name,namelen) \
 	zend_hash_del(&PS(vars), name, namelen + 1);
 
-#define PS_DEL_VAR(name) PS_DEL_VARL(name, strlen(name))
-
 #define PS_ENCODE_VARS 											\
 	char *key;													\
 	uint key_length;											\
diff --git a/ext/session/session.c b/ext/session/session.c
index 73acb37c0df..30c31a45d42 100644
--- a/ext/session/session.c
+++ b/ext/session/session.c
@@ -1276,7 +1276,7 @@ PHP_FUNCTION(session_unregister)
 	
 	convert_to_string_ex(p_name);
 	
-	PS_DEL_VAR(Z_STRVAL_PP(p_name));
+	PS_DEL_VARL(Z_STRVAL_PP(p_name), Z_STRLEN_PP(p_name));
 
 	RETURN_TRUE;
 }