diff --git a/reactos/dll/win32/ws2_32/src/addrinfo.c b/reactos/dll/win32/ws2_32/src/addrinfo.c
index f3dd3d50119..14f5d874fc8 100644
--- a/reactos/dll/win32/ws2_32/src/addrinfo.c
+++ b/reactos/dll/win32/ws2_32/src/addrinfo.c
@@ -1028,7 +1028,7 @@ getnameinfo(const struct sockaddr FAR *sa,
     {
         /* Setup the data for it */
         ServiceString = ServiceBuffer;
-        ServLength = sizeof(ServiceBuffer) - 1;
+        ServLength = sizeof(ServiceBuffer) / sizeof(WCHAR);
     }
   
     /* Now call the unicode function */