diff --git a/platformio/boards/stm32.json b/platformio/boards/stm32.json
index 03c7a803..bebf43ca 100644
--- a/platformio/boards/stm32.json
+++ b/platformio/boards/stm32.json
@@ -2,11 +2,11 @@
     "stm32f4discovery": {
         "build": {
             "core": "stm32",
+            "extra_flags": "-DSTM32F40_41xxx",
             "f_cpu": "168000000L",
             "ldscript": "stm32f405x6.ld",
             "mcu": "cortex-m4",
-            "variant": "stm32f4",
-            "extra_flags": "-DSTM32F40_41xxx"
+            "variant": "stm32f4"            
         },
         "name": "STM32F4Discovery (168 MHz) with digital accelerometer, digital microphone, audio DAC",
         "platform": "stm32",
@@ -18,11 +18,11 @@
     "stm32ldiscovery": {
         "build": {
             "core": "stm32",
+            "extra_flags": "-DSTM32L1XX_MD",
             "f_cpu": "32000000L",
             "ldscript": "stm32l15xx6.ld",
             "mcu": "cortex-m3",
-            "variant": "stm32l1",
-            "extra_flags": "-DSTM32L1XX_MD"
+            "variant": "stm32l1"            
         },
         "name": "STM32LDiscovery (32 MHz) ultra low-power development kit",
         "platform": "stm32",
@@ -34,11 +34,11 @@
     "stm32f3discovery": {
         "build": {
             "core": "stm32",
+            "extra_flags": "-DSTM32F303xC",
             "f_cpu": "72000000L",
             "ldscript": "stm32f30xx.ld",
             "mcu": "cortex-m4",
-            "variant": "stm32f3",
-            "extra_flags": "-DSTM32F303xC"
+            "variant": "stm32f3"
         },
         "name": "STM32F3Discovery (72 MHz) with accelerometer, gyroscope and e-compass",
         "platform": "stm32",