diff --git a/ports/stm32/extint.c b/ports/stm32/extint.c
index 24a68c2a22..41943f1cdb 100644
--- a/ports/stm32/extint.c
+++ b/ports/stm32/extint.c
@@ -83,7 +83,7 @@
 
 // TODO Add python method to change callback object.
 
-#define EXTI_OFFSET	(EXTI_BASE - PERIPH_BASE)
+#define EXTI_OFFSET (EXTI_BASE - PERIPH_BASE)
 
 // Macro used to set/clear the bit corresponding to the line in the IMR/EMR
 // register in an atomic fashion by using bitband addressing.
diff --git a/ports/stm32/usb.h b/ports/stm32/usb.h
index d39f49a6cc..456f45208a 100644
--- a/ports/stm32/usb.h
+++ b/ports/stm32/usb.h
@@ -44,8 +44,8 @@ typedef enum {
 } pyb_usb_storage_medium_t;
 
 typedef enum {
-	USB_PHY_FS_ID = 0,
-	USB_PHY_HS_ID = 1,
+    USB_PHY_FS_ID = 0,
+    USB_PHY_HS_ID = 1,
 } USB_PHY_ID;
 
 extern mp_uint_t pyb_usb_flags;