diff --git a/ARM_Tag_FW/Newton_M3_nRF52811/platformio.ini b/ARM_Tag_FW/Newton_M3_nRF52811/platformio.ini
index c178981f..22306a9c 100644
--- a/ARM_Tag_FW/Newton_M3_nRF52811/platformio.ini
+++ b/ARM_Tag_FW/Newton_M3_nRF52811/platformio.ini
@@ -1,5 +1,5 @@
 [platformio]
-core_dir = D:/Documents/GitHub/OpenEPaperLink/ARM_Tag_FW/Newton_M3_nRF52811/core
+core_dir = ${PROJECT_DIR}/core
 
 [env]
 platform = nordicnrf52@9.6.0
diff --git a/ARM_Tag_FW/nRF_Bootloader/platformio.ini b/ARM_Tag_FW/nRF_Bootloader/platformio.ini
index 30144d95..bcb28e70 100644
--- a/ARM_Tag_FW/nRF_Bootloader/platformio.ini
+++ b/ARM_Tag_FW/nRF_Bootloader/platformio.ini
@@ -1,5 +1,5 @@
 [platformio]
-core_dir = $PROJECT_DIR/core
+core_dir = ${PROJECT_DIR}/core
 
 [env]
 platform = nordicnrf52@9.6.0
diff --git a/ARM_Tag_FW/nrf52811_Platformio_AP/platformio.ini b/ARM_Tag_FW/nrf52811_Platformio_AP/platformio.ini
index 839ac880..a656364c 100644
--- a/ARM_Tag_FW/nrf52811_Platformio_AP/platformio.ini
+++ b/ARM_Tag_FW/nrf52811_Platformio_AP/platformio.ini
@@ -1,5 +1,5 @@
 [platformio]
-core_dir = $PROJECT_DIR/core
+core_dir = ${PROJECT_DIR}/core
 
 [env:nrf52811_OEPL_AP]
 platform = nordicnrf52