diff --git a/contrib/adaptive-compression/adapt.c b/contrib/adaptive-compression/adapt.c
index 84e689a2..3c6b7e90 100644
--- a/contrib/adaptive-compression/adapt.c
+++ b/contrib/adaptive-compression/adapt.c
@@ -548,7 +548,7 @@ static void* outputThread(void* arg)
             }
             {
                 // size_t const writeSize = fwrite(job->dst.start, 1, compressedSize, dstFile);
-                size_t const blockSize = compressedSize >> 7;
+                size_t const blockSize = MAX(compressedSize >> 7, 64 << 10);
                 size_t pos = 0;
                 for ( ; ; ) {
                     size_t const writeSize = MIN(remaining, blockSize);