diff --git a/firmware/drivers/fat.c b/firmware/drivers/fat.c
index 380139afcb..08c915d39b 100644
--- a/firmware/drivers/fat.c
+++ b/firmware/drivers/fat.c
@@ -280,6 +280,8 @@ static struct bpb
 #ifdef STORAGE_NEEDS_BOUNCE_BUFFER
 #if defined(MAX_VARIABLE_LOG_SECTOR)
 #define BOUNCE_SECTOR_SIZE MAX_VARIABLE_LOG_SECTOR
+#elif defined(MAX_PHYS_SECTOR_SIZE)
+#define BOUNCE_SECTOR_SIZE MAX_PHYS_SECTOR_SIZE
 #else
 #define BOUNCE_SECTOR_SIZE SECTOR_SIZE
 #endif