diff --git a/.github/workflows/build-platformio.yml b/.github/workflows/build-platformio.yml
index 3e38797..3236da8 100644
--- a/.github/workflows/build-platformio.yml
+++ b/.github/workflows/build-platformio.yml
@@ -4,7 +4,10 @@ on: [push]
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ windows-latest, ubuntu-latest ]
 
     steps:
       - uses: actions/checkout@v3
diff --git a/Platformio/platformio.ini b/Platformio/platformio.ini
index bcaff30..ca07004 100644
--- a/Platformio/platformio.ini
+++ b/Platformio/platformio.ini
@@ -91,7 +91,7 @@ build_flags =
   ; --------------- LVGL Defines --------------------------------------
   -D LV_TICK_CUSTOM=1
   -D LV_TICK_CUSTOM_INCLUDE="\"Arduino.h\""
-  -D LV_TICK_CUSTOM_SYS_TIME_EXPR="\(millis\(\)\)"
+  -D LV_TICK_CUSTOM_SYS_TIME_EXPR="'(millis())'"
 
   ; ------------- Includes --------------------------------------------
   -I HAL/Targets/ESP32