diff --git a/include/os/osFile.h b/include/os/osFile.h
index 8d03759d820e5ed24ab286fbb5e8b9ddcf81576e..2b0abc60aed4c9a14c253a1b29628a6efe7bfbf4 100644
--- a/include/os/osFile.h
+++ b/include/os/osFile.h
@@ -54,7 +54,7 @@ int32_t taosFtruncateFile(FileFd fd, int64_t length);
 int32_t taosFsyncFile(FileFd fd);
 
 int64_t taosReadFile(FileFd fd, void *buf, int64_t count);
-int64_t taosWriteFile(FileFd fd, void *buf, int64_t count);
+int64_t taosWriteFile(FileFd fd, const void *buf, int64_t count);
 
 void taosCloseFile(FileFd fd);
 
diff --git a/source/os/src/osFile.c b/source/os/src/osFile.c
index bdf3a53dcb26c36744470b170f3364d2ad99480e..60155c8fb9cd25f6f31b242bf26bed7e5a384a34 100644
--- a/source/os/src/osFile.c
+++ b/source/os/src/osFile.c
@@ -120,7 +120,7 @@ int64_t taosReadFile(FileFd fd, void *buf, int64_t count) {
   return count;
 }
 
-int64_t taosWriteFile(FileFd fd, void *buf, int64_t n) {
+int64_t taosWriteFile(FileFd fd, const void *buf, int64_t n) {
   int64_t nleft = n;
   int64_t nwritten = 0;
   char *  tbuf = (char *)buf;