diff --git a/include/system/radio.h b/include/system/radio.h
index d73d3ae..36e2188 100644
--- a/include/system/radio.h
+++ b/include/system/radio.h
@@ -170,7 +170,8 @@
     bool             stereo;    /* program is stereo or not */
     bool             digital;   /* digital program or not (e.g HD Radio program) */
     unsigned int     signal_strength; /* signal strength from 0 to 100 */
-    radio_metadata_t *metadata; /* non null if meta data are present (e.g PTY, song title ...) */
+                                /* meta data (e.g PTY, song title ...), must not be NULL */
+    __attribute__((aligned(8))) radio_metadata_t *metadata;
 } radio_program_info_t;