diff --git a/lib/chunkio/src/cio_file.c b/lib/chunkio/src/cio_file.c
index 1cb9435d0ac..4099734a384 100644
--- a/lib/chunkio/src/cio_file.c
+++ b/lib/chunkio/src/cio_file.c
@@ -390,7 +390,6 @@ static int mmap_file(struct cio_ctx *ctx, struct cio_chunk *ch, size_t size)
     }
 
     /* Map the file */
-    size = ROUND_UP(size, ctx->page_size);
     cf->map = mmap(0, size, oflags, MAP_SHARED, cf->fd, 0);
     if (cf->map == MAP_FAILED) {
         cio_errno();