diff --git a/lib/libefi/rdwr_efi.c b/lib/libefi/rdwr_efi.c
index c317d24f8b2f..0600a9523ebc 100644
--- a/lib/libefi/rdwr_efi.c
+++ b/lib/libefi/rdwr_efi.c
@@ -87,7 +87,7 @@ struct dk_map2  default_vtoc_map[NDKMAP] = {
 
 #if defined(_SUNOS_VTOC_16)
 
-#if defined(i386) || defined(__amd64)
+#if defined(i386) || defined(__amd64) || defined(__arm)
 	{	V_BOOT,		V_UNMNT	},		/* i - 8 */
 	{	V_ALTSCTR,	0	},		/* j - 9 */
 
diff --git a/lib/libspl/include/sys/isa_defs.h b/lib/libspl/include/sys/isa_defs.h
index 677e4fda0c9d..4ab07eb2b5f5 100644
--- a/lib/libspl/include/sys/isa_defs.h
+++ b/lib/libspl/include/sys/isa_defs.h
@@ -102,7 +102,26 @@ extern "C" {
 
 #define        _SUNOS_VTOC_16
 
-#else /* Currently only x86_64, i386, and powerpc arches supported */
+/* arm arch specific defines */
+#elif defined(__arm) || defined(__arm__)
+
+#if !defined(__arm)
+#define __arm
+#endif
+
+#if !defined(__arm__)
+#define __arm__
+#endif
+
+#if defined(__ARMEL__)
+#define _LITTLE_ENDIAN
+#else
+#define _BIG_ENDIAN
+#endif
+
+#define        _SUNOS_VTOC_16
+
+#else /* Currently only x86_64, i386, arm, and powerpc arches supported */
 #error "Unsupported ISA type"
 #endif