1 files changed, 1 insertions, 1 deletions

diff --git a/firmware/drivers/fat.c b/firmware/drivers/fat.c
index 65c6a3152e..80aaaa13b4 100644
--- a/firmware/drivers/fat.c
+++ b/firmware/drivers/fat.c
@@ -1503,7 +1503,7 @@ static void randomize_dos_name(unsigned char *name)
     int i;
     unsigned char buf[5];
 
-    snprintf(buf, sizeof buf, "%04x", (unsigned)rand() & 0xffff);
+    snprintf(buf, sizeof buf, "%04X", (unsigned)rand() & 0xffff);
 
     for (i = 0; (i < 4) && (name[i] != ' '); i++);
     /* account for possible shortname length < 4 */