diff --git a/radio/Radio.cpp b/radio/Radio.cpp
index 3c04fb0..fa39589 100644
--- a/radio/Radio.cpp
+++ b/radio/Radio.cpp
@@ -240,20 +240,31 @@
         return;
     }
 
+    // The event layout in shared memory is:
+    // sizeof(struct radio_event) bytes : the event itself
+    // 4 bytes                          : metadata size or 0
+    // N bytes                          : metadata if present
     struct radio_event *event = (struct radio_event *)eventMemory->pointer();
+    uint32_t metadataOffset = sizeof(struct radio_event) + sizeof(uint32_t);
+    uint32_t metadataSize = *(uint32_t *)((uint8_t *)event + metadataOffset - sizeof(uint32_t));
+
     // restore local metadata pointer from offset
     switch (event->type) {
     case RADIO_EVENT_TUNED:
     case RADIO_EVENT_AF_SWITCH:
-        if (event->info.metadata != NULL) {
+        if (metadataSize != 0) {
             event->info.metadata =
-                    (radio_metadata_t *)((char *)event + (size_t)event->info.metadata);
+                    (radio_metadata_t *)((uint8_t *)event + metadataOffset);
+        } else {
+            event->info.metadata = 0;
         }
         break;
     case RADIO_EVENT_METADATA:
-        if (event->metadata != NULL) {
+        if (metadataSize != 0) {
             event->metadata =
-                    (radio_metadata_t *)((char *)event + (size_t)event->metadata);
+                    (radio_metadata_t *)((uint8_t *)event + metadataOffset);
+        } else {
+            event->metadata = 0;
         }
         break;
     default: