diff --git a/software/include/hw/mem.h b/software/include/hw/mem.h
index f189718bd..2298a4ea1 100644
--- a/software/include/hw/mem.h
+++ b/software/include/hw/mem.h
@@ -9,7 +9,9 @@
 
 #define FLASH_OFFSET_REGULAR_BITSTREAM	0x006E0000 /* 1536k */
 #define FLASH_OFFSET_REGULAR_BIOS	0x00860000 /* 128k */
-#define FLASH_OFFSET_REGULAR_APP	0x00880000 /* remaining space (24064k) */
+#define FLASH_OFFSET_REGULAR_APP	0x00880000 /* 4736k */
+
+#define FLASH_OFFSET_FILESYSTEM		0x00D20000 /* 19328k (remaining space) */
 
 #define FLASH_OFFSET_MAC_ADDRESS	0x002200E0 /* within rescue BIOS */