diff --git a/script/run-in-vsenv.py b/script/run-in-vsenv.py
index 0fe1da1..47240c9 100755
--- a/script/run-in-vsenv.py
+++ b/script/run-in-vsenv.py
@@ -53,14 +53,14 @@ class Args:
 def main():
     args, rest = parse_args()
 
-    if not rest:
-        print("Must specify a command to run inside the Visual Studio environment.")
-        sys.exit(1)
-
     if not is_windows():
         print("This script only works on Windows.")
         sys.exit(1)
 
+    if not rest:
+        print("Must specify a command to run inside the Visual Studio environment.")
+        sys.exit(1)
+
     if not "COMSPEC" in os.environ:
         print("COMSPEC environment variable is not defined, cannot proceed.")
         sys.exit(1)