diff --git a/services/framecache/src/slot.h b/services/framecache/src/slot.h
index 057639c..c4d5e76 100644
--- a/services/framecache/src/slot.h
+++ b/services/framecache/src/slot.h
@@ -39,7 +39,7 @@ typedef struct {
     _Atomic uint64_t dropped_frames;
     char     source_type[32];          /* "deltacast" | "blackmagic" | "srt" | "rtmp" */
     char     slot_id[FC_MAX_SLOT_ID];
-    uint8_t  _pad[FC_HEADER_SIZE - 112];
+    uint8_t  _pad[FC_HEADER_SIZE - 144];
 } fc_header_t;
 
 /* Per-frame metadata + data (variable length — use fc_frame_at() accessor) */