diff --git a/libavcodec/iff.c b/libavcodec/iff.c
index 4099d118e4..c6e2359b00 100644
--- a/libavcodec/iff.c
+++ b/libavcodec/iff.c
@@ -280,6 +280,16 @@ static int extract_header(AVCodecContext *const avctx,
         for (i = 0; i < 16; i++)
             s->tvdc[i] = bytestream_get_be16(&buf);
 
+        if (s->ham) {
+            if (s->bpp > 8) {
+                av_log(avctx, AV_LOG_ERROR, "Invalid number of hold bits for HAM: %u\n", s->ham);
+                return AVERROR_INVALIDDATA;
+            } if (s->ham != (s->bpp > 6 ? 6 : 4)) {
+                av_log(avctx, AV_LOG_ERROR, "Invalid number of hold bits for HAM: %u, BPP: %u\n", s->ham, s->bpp);
+                return AVERROR_INVALIDDATA;
+            }
+        }
+
         if (s->masking == MASK_HAS_MASK) {
             if (s->bpp >= 8 && !s->ham) {
                 avctx->pix_fmt = AV_PIX_FMT_RGB32;
@@ -307,9 +317,6 @@ static int extract_header(AVCodecContext *const avctx,
         if (!s->bpp || s->bpp > 32) {
             av_log(avctx, AV_LOG_ERROR, "Invalid number of bitplanes: %u\n", s->bpp);
             return AVERROR_INVALIDDATA;
-        } else if (s->ham >= 8) {
-            av_log(avctx, AV_LOG_ERROR, "Invalid number of hold bits for HAM: %u\n", s->ham);
-            return AVERROR_INVALIDDATA;
         }
 
         av_freep(&s->ham_buf);