diff --git a/tools/platformio-build.py b/tools/platformio-build.py
index 63c82b02c4..cf996ffaa4 100644
--- a/tools/platformio-build.py
+++ b/tools/platformio-build.py
@@ -97,8 +97,8 @@ def scons_patched_match_splitext(path, suffixes=None):
         "__ets__",
         "ICACHE_FLASH",
         ("ARDUINO", 10805),
-        ("ARDUINO_BOARD", '\\"PLATFORMIO_%s\\"'
-            % env.BoardConfig().id.upper()),
+        ("ARDUINO_BOARD", '\\"PLATFORMIO_%s\\"' % env.BoardConfig().id.upper()),
+        "FLASHMODE_${BOARD_FLASH_MODE.upper()}",
         "LWIP_OPEN_SRC"
     ],