diff --git a/src/os/src/windows/wSemphone.c b/src/os/src/windows/wSemphone.c
index e72a6cb0910d2246f6350014f74a6eb3a9e531fd..02e6247bba64a73516e0932313a60b8ab08ef6e4 100644
--- a/src/os/src/windows/wSemphone.c
+++ b/src/os/src/windows/wSemphone.c
@@ -49,6 +49,6 @@ int32_t taosGetCurrentAPPName(char *name, int32_t* len) {
   strcpy(name, filepath);
 
   if (len != NULL) {
-    len = strlen(filepath);
+    *len = strlen(filepath);
   }
 }
\ No newline at end of file