diff --git a/services/ptable_parse/ptable.h b/services/ptable_parse/ptable.h
index ab4d284f8db15b1b5c25bd9d0f565b315a247e93..654e10d80179d4e2a53f89356d7e9687581d11d3 100644
--- a/services/ptable_parse/ptable.h
+++ b/services/ptable_parse/ptable.h
@@ -75,7 +75,7 @@ public:
     uint32_t GetPtablePartitionNum() const;
     void SetReservedSize(uint64_t reservedSize);
     bool InitPtable();
-    uint32_t GetDefaultImageSize() const;
+    virtual uint32_t GetDefaultImageSize() const;
     void PrintPtableInfo() const;
     void PrintPtableInfo(const std::vector<PtnInfo> &ptnInfo) const;
     bool GetPartionInfoByName(const std::string &partitionName, PtnInfo &ptnInfo, int32_t &index);