diff --git a/platformio.ini b/platformio.ini
index d397030b2b3d1..56f13621cbb46 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -1279,7 +1279,9 @@ debug_init_break  =
 
 [stm32_flash_drive]
 platform_packages = framework-arduinoststm32@https://github.com/rhapsodyv/Arduino_Core_STM32/archive/usb-host-msc.zip
-build_flags       = -DHAL_PCD_MODULE_ENABLED -DHAL_HCD_MODULE_ENABLED -DUSBHOST -DUSBH_IRQ_PRIO=3 -DUSBH_IRQ_SUBPRIO=4
+build_flags       = ${common_stm32.build_flags}
+  -DHAL_PCD_MODULE_ENABLED -DHAL_HCD_MODULE_ENABLED
+  -DUSBHOST -DUSBH_IRQ_PRIO=3 -DUSBH_IRQ_SUBPRIO=4
 
 #
 # BigTreeTech SKR Pro (STM32F407ZGT6 ARM Cortex-M4) with USB Flash Drive Support
@@ -1287,7 +1289,7 @@ build_flags       = -DHAL_PCD_MODULE_ENABLED -DHAL_HCD_MODULE_ENABLED -DUSBHOST
 [env:BIGTREE_SKR_PRO_usb_flash_drive]
 extends           = env:BIGTREE_SKR_PRO
 platform_packages = ${stm32_flash_drive.platform_packages}
-build_flags       = ${common_stm32.build_flags} ${stm32_flash_drive.build_flags}
+build_flags       = ${stm32_flash_drive.build_flags}
 
 #
 # Bigtreetech GTR V1.0 (STM32F407IGT6 ARM Cortex-M4)
@@ -1307,7 +1309,7 @@ build_flags       = ${common_stm32.build_flags}
 [env:BIGTREE_GTR_V1_0_usb_flash_drive]
 extends           = env:BIGTREE_GTR_V1_0
 platform_packages = ${stm32_flash_drive.platform_packages}
-build_flags       = ${common_stm32.build_flags} ${stm32_flash_drive.build_flags}
+build_flags       = ${stm32_flash_drive.build_flags}
 
 #
 # BigTreeTech BTT002 V1.0 (STM32F407VGT6 ARM Cortex-M4)
@@ -1413,7 +1415,7 @@ extra_scripts        = ${common.extra_scripts}
 platform             = ${common_stm32.platform}
 platform_packages    = ${stm32_flash_drive.platform_packages}
 extends              = common_stm32
-build_flags          = ${common_stm32.build_flags} ${stm32_flash_drive.build_flags}
+build_flags          = ${stm32_flash_drive.build_flags}
 board                = genericSTM32F407VET6
 board_build.core     = stm32
 board_build.variant  = MARLIN_F4x7Vx
@@ -1456,7 +1458,7 @@ extra_scripts        = ${common.extra_scripts}
 [env:mks_robin_nano_v3_usb_flash_drive]
 extends           = env:mks_robin_nano_v3
 platform_packages = ${stm32_flash_drive.platform_packages}
-build_flags       = ${common_stm32.build_flags} ${stm32_flash_drive.build_flags}
+build_flags       = ${stm32_flash_drive.build_flags}
   -DUSBCON
   -DUSE_USBHOST_HS
   -DUSBD_IRQ_PRIO=5