1 files changed, 12 insertions, 1 deletions
diff --git a/std/wasi/snapshot_preview1.ts b/std/wasi/snapshot_preview1.ts
index d52b81635..4fe4e02b4 100644
--- a/std/wasi/snapshot_preview1.ts
+++ b/std/wasi/snapshot_preview1.ts
@@ -607,7 +607,18 @@ export default class Module {
       },
 
       fd_filestat_set_size: (fd: number, size: bigint): number => {
-        return ERRNO_NOSYS;
+        const entry = this.fds[fd];
+        if (!entry) {
+          return ERRNO_BADF;
+        }
+
+        try {
+          Deno.ftruncateSync(entry.handle.rid, Number(size));
+        } catch (err) {
+          return errno(err);
+        }
+
+        return ERRNO_SUCCESS;
       },
 
       fd_filestat_set_times: (