diff --git a/fusee/fusee-secondary/src/key_derivation.c b/fusee/fusee-secondary/src/key_derivation.c
index 147d5cb36..c00fd781e 100644
--- a/fusee/fusee-secondary/src/key_derivation.c
+++ b/fusee/fusee-secondary/src/key_derivation.c
@@ -195,14 +195,14 @@ void derive_bis_key(void *dst, BisPartition_t partition_id, u32 target_firmware)
     };
     
     static const u8 bis_kek_source[0x10] = {0x34, 0xC1, 0xA0, 0xC4, 0x82, 0x58, 0xF8, 0xB4, 0xFA, 0x9E, 0x5E, 0x6A, 0xDA, 0xFC, 0x7E, 0x4F};
-	
-	const int key_source_idx = (partition_id > 2) ? 2 : partition_id;    
+
+    const int key_source_idx = (partition_id > 2) ? 2 : partition_id;    
     switch (partition_id) {
         case BisPartition_Calibration:
             fusee_generate_specific_aes_key(dst, key_source_for_bis[key_source_idx][0], false, target_firmware);
             fusee_generate_specific_aes_key(dst + 0x10, key_source_for_bis[key_source_idx][1], false, target_firmware);
             break;
-		case BisPartition_Safe:
+        case BisPartition_Safe:
         case BisPartition_User:
         case BisPartition_System:
             fusee_generate_personalized_aes_key_for_bis(dst, bis_kek_source, key_source_for_bis[key_source_idx][0], target_firmware);
diff --git a/fusee/fusee-secondary/src/key_derivation.h b/fusee/fusee-secondary/src/key_derivation.h
index 06eef2c99..244a83052 100644
--- a/fusee/fusee-secondary/src/key_derivation.h
+++ b/fusee/fusee-secondary/src/key_derivation.h
@@ -16,7 +16,7 @@
 
 typedef enum {
     BisPartition_Calibration = 0,
-	BisPartition_Safe = 1,
+    BisPartition_Safe = 1,
     BisPartition_User = 2,
     BisPartition_System = 3
 } BisPartition_t;