diff --git a/libraries/SD/src/SD.h b/libraries/SD/src/SD.h
index 71d0102bd..4f2dc5a7a 100644
--- a/libraries/SD/src/SD.h
+++ b/libraries/SD/src/SD.h
@@ -27,7 +27,7 @@
 #undef FILE_READ
 #define FILE_READ sdfat::O_READ
 #undef FILE_WRITE
-#define FILE_WRITE (sdfat::O_READ | sdfat::O_WRITE | sdfat::O_CREAT)
+#define FILE_WRITE (sdfat::O_READ | sdfat::O_WRITE | sdfat::O_CREAT | sdfat::O_APPEND)
 
 class SDClass {
 public:
diff --git a/tests/host/fs/test_fs.cpp b/tests/host/fs/test_fs.cpp
index 322f057d9..9cd4fcc1e 100644
--- a/tests/host/fs/test_fs.cpp
+++ b/tests/host/fs/test_fs.cpp
@@ -350,10 +350,10 @@ TEST_CASE("Multisplendored File::writes", "[fs]")
     f.write((const uint8_t*)&bigone, 4);
     f.close();
     REQUIRE(readFileSD("/file.txt") == "aAbbcctheendxyz@@@@");
-    File g = SD.open("/file.txt", FILE_WRITE);
+    File g = SD.open("/file2.txt", FILE_WRITE);
     g.write(0);
     g.close();
-    g = SD.open("/file.txt", FILE_READ);
+    g = SD.open("/file2.txt", FILE_READ);
     uint8_t u = 0x66;
     g.read(&u, 1);
     g.close();