diff --git a/libavcodec/vvc/vvc_filter.c b/libavcodec/vvc/vvc_filter.c
index 6b4c2050c7..de0816619b 100644
--- a/libavcodec/vvc/vvc_filter.c
+++ b/libavcodec/vvc/vvc_filter.c
@@ -1199,6 +1199,7 @@ void ff_vvc_alf_copy_ctu_to_hv(VVCLocalContext* lc, const int x0, const int y0)
 void ff_vvc_alf_filter(VVCLocalContext *lc, const int x0, const int y0)
 {
     VVCFrameContext *fc     = lc->fc;
+    const VVCSPS *sps       = fc->ps.sps;
     const VVCPPS *pps       = fc->ps.pps;
     const int rx            = x0 >> fc->ps.sps->ctb_log2_size_y;
     const int ry            = y0 >> fc->ps.sps->ctb_log2_size_y;
@@ -1207,6 +1208,7 @@ void ff_vvc_alf_filter(VVCLocalContext *lc, const int x0, const int y0)
     const int padded_stride = EDGE_EMU_BUFFER_STRIDE << ps;
     const int padded_offset = padded_stride * ALF_PADDING_SIZE + (ALF_PADDING_SIZE << ps);
     const int c_end         = fc->ps.sps->r->sps_chroma_format_idc ? VVC_MAX_SAMPLE_ARRAYS : 1;
+    const int subpic_idx    = lc->sc->sh.r->curr_subpic_idx;
     ALFParams *alf          = &CTB(fc->tab.alf, rx, ry);
     int edges[MAX_EDGES]    = { rx == 0, ry == 0, rx == pps->ctb_width - 1, ry == pps->ctb_height - 1 };
 
@@ -1224,6 +1226,13 @@ void ff_vvc_alf_filter(VVCLocalContext *lc, const int x0, const int y0)
         edges[BOTTOM] = edges[BOTTOM] || CTB(fc->tab.slice_idx, rx, ry) != CTB(fc->tab.slice_idx, rx, ry + 1);
     }
 
+    if (!sps->r->sps_loop_filter_across_subpic_enabled_flag[subpic_idx]) {
+        edges[LEFT]   = edges[LEFT] || (lc->boundary_flags & BOUNDARY_LEFT_SUBPIC);
+        edges[TOP]    = edges[TOP] || (lc->boundary_flags & BOUNDARY_UPPER_SUBPIC);
+        edges[RIGHT]  = edges[RIGHT] || fc->ps.sps->r->sps_subpic_ctu_top_left_x[subpic_idx] + fc->ps.sps->r->sps_subpic_width_minus1[subpic_idx] == rx;
+        edges[BOTTOM] = edges[BOTTOM] || fc->ps.sps->r->sps_subpic_ctu_top_left_y[subpic_idx] + fc->ps.sps->r->sps_subpic_height_minus1[subpic_idx] == ry;
+    }
+
     for (int c_idx = 0; c_idx < c_end; c_idx++) {
         const int hs = fc->ps.sps->hshift[c_idx];
         const int vs = fc->ps.sps->vshift[c_idx];