diff --git a/rostests/winetests/ntdsapi/ntdsapi.c b/rostests/winetests/ntdsapi/ntdsapi.c
index 08436ae8e85..8290ed2cbf1 100644
--- a/rostests/winetests/ntdsapi/ntdsapi.c
+++ b/rostests/winetests/ntdsapi/ntdsapi.c
@@ -28,15 +28,6 @@
 
 #include "wine/test.h"
 
-static const char *wine_dbgstr_w(LPCWSTR str)
-{
-    static char buf[512];
-    if (!str)
-        return "(null)";
-    WideCharToMultiByte(CP_ACP, 0, str, -1, buf, sizeof(buf), NULL, NULL);
-    return buf;
-}
-
 static void test_DsMakeSpn(void)
 {
     DWORD ret;