diff --git a/frameworks/native/backup_ext/src/untar_file.cpp b/frameworks/native/backup_ext/src/untar_file.cpp
index f78ce3c9dc93679ea0ba7f08178d4e7912ff74e0..87d6f9454459f932e2be3732eca0a1b1f8052e65 100644
--- a/frameworks/native/backup_ext/src/untar_file.cpp
+++ b/frameworks/native/backup_ext/src/untar_file.cpp
@@ -674,7 +674,7 @@ std::tuple<int, std::string> UntarFile::ParsePaxBlock()
             break;
         }
         string pathLen = content.substr(pos, lenEnd - pos);
-        recLen = std::atoi(pathLen.c_str());
+        recLen = static_cast<uint32_t>(std::atoi(pathLen.c_str()));
         allLen = recLen + OTHER_HEADER;
         if (allLen > BLOCK_SIZE) {
             isLongName = true;
@@ -740,7 +740,7 @@ std::tuple<int, std::string> UntarFile::GetLongName(uint32_t recLen, uint32_t al
             break;
         }
         string pathLen = content.substr(pos, lenEnd - pos);
-        int recLen = std::atoi(pathLen.c_str());
+        size_t recLen = static_cast<size_t>(std::atoi(pathLen.c_str()));
         string KvPair = content.substr(lenEnd + 1, recLen - (lenEnd - pos + 1));
         size_t eqPos = KvPair.find('=');
         if (eqPos == string::npos) {