diff --git a/bench/lzbench.cpp b/bench/lzbench.cpp
index 74a4329..9006ed5 100644
--- a/bench/lzbench.cpp
+++ b/bench/lzbench.cpp
@@ -288,11 +288,15 @@ inline int64_t lzbench_compress(lzbench_params_t *params, std::vector<size_t>& c
.
         clen = compress((char*)inbuf, part, (char*)outbuf, outpart, codec_options);
.
-        if (clen <= 0)
+        if (clen <= 0 || clen == part)
         {
-            LZBENCH_PRINT(9, "ERROR: part=%lu clen=%ld in=%lu out=%lu\n", (uint64_t)part, clen, (uint64_t)(inbuf-start), (uint64_t)sum);
-            LZBENCH_PRINT(0, "ERROR: compression error in=%zu out=%ld/%zu (in_bytes=%lu out_bytes=%ld)\n", part, clen, outpart, (uint64_t)(inbuf+part-start), (int64_t)sum+clen);
-            return 0;
+            if (part > outsize) {
+                LZBENCH_PRINT(9, "ERROR: part=%lu clen=%ld in=%lu out=%lu\n", (uint64_t)part, clen, (uint64_t)(inbuf-start), (uint64_t)sum);
+                LZBENCH_PRINT(0, "ERROR: compression error in=%zu out=%ld/%zu (in_bytes=%lu out_bytes=%ld)\n", part, clen, outpart, (uint64_t)(inbuf+part-start), (int64_t)sum+clen);
+                return 0;
+            }
+            memcpy(outbuf, inbuf, part);
+            clen = part;
         }
.
         inbuf += part;
@@ -324,7 +328,13 @@ inline int64_t lzbench_decompress(lzbench_params_t *params, std::vector<size_t>&
         }
#endif
.
-        dlen = decompress((char*)inbuf, part, (char*)outbuf, chunk_sizes[i], codec_options);
+        if (part == chunk_sizes[i]) // uncompressed
+        {
+            memcpy(outbuf, inbuf, part);
+            dlen = part;
+        } else {
+            dlen = decompress((char*)inbuf, part, (char*)outbuf, chunk_sizes[i], codec_options);
+        }
.
         if (dlen <= 0) {
             LZBENCH_PRINT(9, "DEC part=%lu dlen=%ld out=%lu\n", (uint64_t)part, dlen, (uint64_t)(outbuf - outstart));