diff --git a/modules/video_filter/gradfun.c b/modules/video_filter/gradfun.c
index 765cf64360..4db3d1deaf 100644
--- a/modules/video_filter/gradfun.c
+++ b/modules/video_filter/gradfun.c
@@ -112,7 +112,7 @@ static int Open(vlc_object_t *object)
     const vlc_fourcc_t fourcc = filter->fmt_in.video.i_chroma;
 
     const vlc_chroma_description_t *chroma = vlc_fourcc_GetChromaDescription(fourcc);
-    if (!chroma || chroma->plane_count < 3) {
+    if (!chroma || chroma->plane_count < 3 || chroma->pixel_size != 1) {
         msg_Err(filter, "Unsupported chroma (%4.4s)", (char*)&fourcc);
         return VLC_EGENERIC;
     }
diff --git a/modules/video_filter/grain.c b/modules/video_filter/grain.c
index 1d5f9ccc4c..cbdb13329f 100644
--- a/modules/video_filter/grain.c
+++ b/modules/video_filter/grain.c
@@ -382,7 +382,7 @@ static int Open(vlc_object_t *object)
 
     const vlc_chroma_description_t *chroma =
         vlc_fourcc_GetChromaDescription(filter->fmt_in.video.i_chroma);
-    if (!chroma || chroma->plane_count < 3) {
+    if (!chroma || chroma->plane_count < 3 || chroma->pixel_size != 1) {
         msg_Err(filter, "Unsupported chroma (%4.4s)",
                 (char*)&(filter->fmt_in.video.i_chroma));
         return VLC_EGENERIC;
diff --git a/modules/video_filter/transform.c b/modules/video_filter/transform.c
index 5e86fc0cfb..9f6a751636 100644
--- a/modules/video_filter/transform.c
+++ b/modules/video_filter/transform.c
@@ -188,7 +188,7 @@ static int Open(vlc_object_t *object)
 
     const vlc_chroma_description_t *chroma =
         vlc_fourcc_GetChromaDescription(src->i_chroma);
-    if (!chroma || chroma->plane_count < 3) {
+    if (!chroma || chroma->plane_count < 3 || chroma->pixel_size != 1) {
         msg_Err(filter, "Unsupported chroma (%4.4s)", (char*)&src->i_chroma);
         /* TODO support packed and rgb */
         return VLC_EGENERIC;