diff --git a/features/unsupported/fs/sd/SDFileSystem.cpp b/features/unsupported/fs/sd/SDFileSystem.cpp
index 34a6498aea..c3305c8af5 100644
--- a/features/unsupported/fs/sd/SDFileSystem.cpp
+++ b/features/unsupported/fs/sd/SDFileSystem.cpp
@@ -293,7 +293,7 @@ uint32_t SDFileSystem::disk_sectors() {
 }
 
 void SDFileSystem::debug(bool dbg){
-	_dbg = dbg;
+    _dbg = dbg;
 }
 
 
diff --git a/features/unsupported/fs/sd/SDFileSystem.h b/features/unsupported/fs/sd/SDFileSystem.h
index 847fccdcbd..3ae0c3167b 100644
--- a/features/unsupported/fs/sd/SDFileSystem.h
+++ b/features/unsupported/fs/sd/SDFileSystem.h
@@ -58,7 +58,7 @@ public:
     virtual int disk_write(const uint8_t* buffer, uint32_t block_number, uint32_t count);
     virtual int disk_sync();
     virtual uint32_t disk_sectors();
-	void debug(bool dbg);
+    void debug(bool dbg);
 
 protected:
 
@@ -85,7 +85,7 @@ protected:
     DigitalOut _cs;
     int cdv;
     int _is_initialized;
-	bool _dbg;
+    bool _dbg;
 };
 
 #endif