diff --git a/rostests/winetests/kernel32/volume.c b/rostests/winetests/kernel32/volume.c
index 3d1d1e3f551..1915836d168 100644
--- a/rostests/winetests/kernel32/volume.c
+++ b/rostests/winetests/kernel32/volume.c
@@ -978,7 +978,8 @@ static void test_GetVolumePathNamesForVolumeNameW(void)
 #ifdef __REACTOS__
     /* due to failing all calls to GetVolumeNameForVolumeMountPointW, this
      * buffer never gets initialized and could cause a buffer overflow later */
-    volume[0] = 0;
+    volume[0] = '$';
+    volume[1] = 0;
 #endif /* __REACTOS__ */
 
     if (!pGetVolumePathNamesForVolumeNameW || !pGetVolumeNameForVolumeMountPointW)