diff --git a/libraries/SD/SD.h b/libraries/SD/SD.h
index 2c5c323a8..d1e53debc 100644
--- a/libraries/SD/SD.h
+++ b/libraries/SD/SD.h
@@ -21,7 +21,7 @@
 #include <utility/SdFatUtil.h>
 
 #define FILE_READ O_READ
-#define FILE_WRITE (O_READ | O_WRITE | O_CREAT | O_SYNC)
+#define FILE_WRITE (O_READ | O_WRITE | O_CREAT)
 
 class File : public Stream {
 public: