diff --git a/src/os/src/windows/wSemphone.c b/src/os/src/windows/wSemphone.c
index 02e6247bba64a73516e0932313a60b8ab08ef6e4..c234265d28e5ea15d28ee767099722181de27607 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 = (int32_t) strlen(filepath);
   }
 }
\ No newline at end of file