diff --git a/ext/pdo/pdo_stmt.c b/ext/pdo/pdo_stmt.c
index 010d6b956f21..0e6c2569388e 100644
--- a/ext/pdo/pdo_stmt.c
+++ b/ext/pdo/pdo_stmt.c
@@ -672,8 +672,9 @@ static HashTable* pdo_class_fetch_prepare_constructor_arguments(const zend_funct
 		} ZEND_HASH_FOREACH_END();
 		return duplicated;
 	} else {
-		GC_ADDREF(ctor_args);
-		return ctor_args;
+		//GC_ADDREF(ctor_args);
+		//return ctor_args;
+		return zend_array_dup(ctor_args);
 	}
 }