diff --git a/platformio/util.py b/platformio/util.py
index e3a02b3d..a82b3c15 100644
--- a/platformio/util.py
+++ b/platformio/util.py
@@ -315,7 +315,7 @@ def get_serialports(use_grep=False):
         result.append({"port": p, "description": d, "hwid": h})
 
     # fix for PySerial
-    if not result:
+    if not result and "Windows" != system():
         result = _grep_serial_ports()
 
     return result