diff --git a/systemdeps.h b/systemdeps.h
index 3c3c064..af4a175 100644
--- a/systemdeps.h
+++ b/systemdeps.h
@@ -120,4 +120,9 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
     #endif /* __APPLE__ || __linux__ || __sun__ || sun */
 
+#if defined(__arm__)
+    #undef POST_PACKED_STRUCTURE
+    #define POST_PACKED_STRUCTURE
+#endif /* __arm__ */
+
 #endif