diff --git a/firmware/common/file.c b/firmware/common/file.c
index 82a33ada2d..6d60595ab1 100644
--- a/firmware/common/file.c
+++ b/firmware/common/file.c
@@ -83,17 +83,13 @@ int open(const char* pathname, int flags)
         errno = EMFILE;
         return -2;
     }
+    memset(&openfiles[fd], 0, sizeof (struct filedesc));
 
-    if (flags & O_RDONLY) {
-        openfiles[fd].write = false;
-    }
-    else {
-        if (flags & (O_RDWR | O_WRONLY)) {
-            openfiles[fd].write = true;
-
-            if (flags & O_TRUNC)
-                openfiles[fd].trunc = true;
-        }
+    if (flags & (O_RDWR | O_WRONLY)) {
+        openfiles[fd].write = true;
+        
+        if (flags & O_TRUNC)
+            openfiles[fd].trunc = true;
     }
     openfiles[fd].busy = true;
 
diff --git a/firmware/common/file.h b/firmware/common/file.h
index 2effe31ac9..bf7ad82ff7 100644
--- a/firmware/common/file.h
+++ b/firmware/common/file.h
@@ -37,9 +37,9 @@
 #define O_RDONLY 0
 #define O_WRONLY 1
 #define O_RDWR   2
-#define O_CREAT  3
-#define O_APPEND 4
-#define O_TRUNC  5
+#define O_CREAT  4
+#define O_APPEND 8
+#define O_TRUNC  0x10
 #endif
 
 #if defined(__MINGW32__) && defined(SIMULATOR)