diff --git a/xen/include/asm-arm/config.h b/xen/include/asm-arm/config.h
index 7ceb5c5a0f..2d11b624c4 100644
--- a/xen/include/asm-arm/config.h
+++ b/xen/include/asm-arm/config.h
@@ -9,8 +9,10 @@
 
 #if defined(CONFIG_ARM_64)
 # define LONG_BYTEORDER 3
+# define ELFSIZE 64
 #else
 # define LONG_BYTEORDER 2
+# define ELFSIZE 32
 #endif
 
 #define BYTES_PER_LONG (1 << LONG_BYTEORDER)
@@ -20,9 +22,6 @@
 /* xen_ulong_t is always 64 bits */
 #define BITS_PER_XEN_ULONG 64
 
-/* And ELF files are also 64-bit. */
-#define ELFSIZE 64
-
 #define CONFIG_PAGING_ASSISTANCE 1
 
 #define CONFIG_PAGING_LEVELS 3