diff --git a/libavcodec/vulkan/ffv1_enc_setup.comp b/libavcodec/vulkan/ffv1_enc_setup.comp
index d58050f281..b861e25f74 100644
--- a/libavcodec/vulkan/ffv1_enc_setup.comp
+++ b/libavcodec/vulkan/ffv1_enc_setup.comp
@@ -51,6 +51,7 @@ void init_slice(out SliceContext sc, const uint slice_idx)
     sc.slice_pos = ivec2(sxs, sys);
     sc.slice_dim = ivec2(sxe - sxs, sye - sys);
     sc.slice_rct_coef = ivec2(1, 1);
+    sc.slice_coding_mode = int(force_pcm == 1);
 
     rac_init(sc.c,
              OFFBUF(u8buf, out_data, slice_idx * slice_size_max),