diff --git a/platformio/ide/tpls/atom/.gcc-flags.json.tpl b/platformio/ide/tpls/atom/.gcc-flags.json.tpl
index 6b9698d5..3d613580 100644
--- a/platformio/ide/tpls/atom/.gcc-flags.json.tpl
+++ b/platformio/ide/tpls/atom/.gcc-flags.json.tpl
@@ -1,5 +1,5 @@
 {
-  "execPath": "{{ cxx_path }}",
+  "execPath": "{{ cxx_path.replace("\\", "/") }}",
   "gccDefaultCFlags": "-Wall -Wno-cpp -fsyntax-only -D{{ ' -D'.join(defines) }}",
   "gccDefaultCppFlags": "-Wall -Wno-cpp -fsyntax-only -D{{ ' -D'.join(defines) }}",
   "gccErrorLimit": 15,