diff --git a/Zend/zend_API.c b/Zend/zend_API.c
index d1c370598aa..44696baad57 100644
--- a/Zend/zend_API.c
+++ b/Zend/zend_API.c
@@ -977,7 +977,7 @@ static int zend_parse_va_args(int num_args, char *type_spec, va_list *va, int fl
 		}
 		
 		if (T_arg_type == -1) {
-			T_arg_type == ZEND_STR_TYPE;
+			T_arg_type = ZEND_STR_TYPE;
 		}
 	}