diff --git a/src/physfs_platform_windows.c b/src/physfs_platform_windows.c
index a490c2f..4a32e9f 100644
--- a/src/physfs_platform_windows.c
+++ b/src/physfs_platform_windows.c
@@ -575,7 +575,7 @@ char *__PHYSFS_platformCalcUserDir(void)
          *  psize. Also note that the second parameter can't be
          *  NULL or the function fails.
          */
-        rc = pGetDir(accessToken, &dummy, &psize);
+        rc = pGetDir(accessToken, NULL, &psize);
         GOTO_IF(rc, PHYSFS_ERR_OS_ERROR, done);  /* should have failed! */
 
         /* Allocate memory for the profile directory */