--- squashfs-tools/_endian.h
+++ squashfs-tools/_endian.h
@@ -3,6 +3,8 @@
 
 #define SQUASHFS4_LE 0
 #define SQUASHFS4_BE 1
+#define AVM_LE 2
+#define AVM_BE 3
 
 #ifndef linux
 #define __BYTE_ORDER BYTE_ORDER
@@ -12,12 +14,12 @@
 #include <endian.h>
 #endif
 
-#if   defined(TARGET_FORMAT) && TARGET_FORMAT == SQUASHFS4_LE
+#if   defined(TARGET_FORMAT) && (TARGET_FORMAT == SQUASHFS4_LE || TARGET_FORMAT == AVM_LE)
 #define TARGET_FORMAT_BYTE_ORDER __LITTLE_ENDIAN
-#elif defined(TARGET_FORMAT) && TARGET_FORMAT == SQUASHFS4_BE
+#elif defined(TARGET_FORMAT) && (TARGET_FORMAT == SQUASHFS4_BE || TARGET_FORMAT == AVM_BE)
 #define TARGET_FORMAT_BYTE_ORDER __BIG_ENDIAN
 #else
-#error "Invalid or no TARGET_FORMAT defined, it's expected to be either SQUASHFS4_LE (for little-endian) or SQUASHFS4_BE (for big-endian)"
+#error "Invalid or no TARGET_FORMAT defined, it's expected to be either SQUASHFS4_LE (for little-endian), SQUASHFS4_BE (for big-endian) or AVM_LE/AVM_BE (for AVM modified little-/big-endian)"
 #endif
 
 #if !(defined(TARGET_FORMAT_BYTE_ORDER) && (TARGET_FORMAT_BYTE_ORDER == __LITTLE_ENDIAN || TARGET_FORMAT_BYTE_ORDER == __BIG_ENDIAN))