diff --git a/services/remote_file_share/src/remote_file_share.cpp b/services/remote_file_share/src/remote_file_share.cpp
index 2e8eb47ca8e2fb13667e008a0fd991cb0c594aaa..2fb470530882a0fcd9e0d919251d28ee145270ce 100644
--- a/services/remote_file_share/src/remote_file_share.cpp
+++ b/services/remote_file_share/src/remote_file_share.cpp
@@ -77,7 +77,7 @@ static std::string GetFileName(const int &fd)
     }
 
     std::string fileName = filePath;
-    int firstSlash = fileName.rfind("/");
+    std::size_t firstSlash = fileName.rfind("/");
     if (firstSlash == fileName.npos) {
         LOGE("RemoteFileShare::GetFileName, get error path with %{public}s", fileName.c_str());
         return "";