diff --git a/defs.h b/defs.h
index e819174..0ac733f 100644
--- a/defs.h
+++ b/defs.h
@@ -228,6 +228,13 @@
 #define PERSONALITY1_WORDSIZE 4
 #endif
 
+#ifdef ARM
+#undef SUPPORTED_PERSONALITIES
+#define SUPPORTED_PERSONALITIES 2
+#define PERSONALITY0_WORDSIZE 4
+#define PERSONALITY1_WORDSIZE 4
+#endif
+
 #ifdef SVR4
 #ifdef HAVE_MP_PROCFS
 extern int mp_ioctl (int f, int c, void *a, int s);