diff --git a/lib/compress/zstdmt_compress.c b/lib/compress/zstdmt_compress.c
index c96ef4825..38f8af2e7 100644
--- a/lib/compress/zstdmt_compress.c
+++ b/lib/compress/zstdmt_compress.c
@@ -474,6 +474,7 @@ size_t ZSTDMT_compress_advanced(ZSTDMT_CCtx* mtctx,
 
     if (nbChunks==1) {   /* fallback to single-thread mode */
         ZSTD_CCtx* const cctx = mtctx->cctxPool->cctx[0];
+        if (cdict) return ZSTD_compress_usingCDict_advanced(cctx, dst, dstCapacity, src, srcSize, cdict, params.fParams);
         return ZSTD_compress_advanced(cctx, dst, dstCapacity, src, srcSize, NULL, 0, params);
     }