diff --git a/lib/std/compress/lzma.zig b/lib/std/compress/lzma.zig
index 597e97a94f..0f1ad1a0b8 100644
--- a/lib/std/compress/lzma.zig
+++ b/lib/std/compress/lzma.zig
@@ -696,6 +696,7 @@ pub const Decompress = struct {
                 .vtable = &.{
                     .readVec = readVec,
                     .stream = stream,
+                    .discard = discard,
                 },
                 .seek = 0,
                 .end = 0,
@@ -746,12 +747,22 @@ pub const Decompress = struct {
         return readIndirect(r);
     }
 
+    fn discard(r: *Reader, limit: std.Io.Limit) Reader.Error!usize {
+        const d: *Decompress = @alignCast(@fieldParentPtr("reader", r));
+        _ = d;
+        _ = limit;
+        @panic("TODO");
+    }
+
     fn readIndirect(r: *Reader) Reader.Error!usize {
         const d: *Decompress = @alignCast(@fieldParentPtr("reader", r));
         const gpa = d.gpa;
         var allocating = Writer.Allocating.initOwnedSlice(gpa, r.buffer);
         allocating.writer.end = r.end;
-        defer r.end = allocating.writer.end;
+        defer {
+            r.buffer = allocating.writer.buffer;
+            r.end = allocating.writer.end;
+        }
         if (d.decode.state == math.maxInt(usize)) return error.EndOfStream;
         d.decode.process(d.input, &allocating, &d.buffer, &d.range_decoder) catch |err| switch (err) {
             error.WriteFailed => {
diff --git a/lib/std/compress/lzma/test.zig b/lib/std/compress/lzma/test.zig
index 2514ddb8c3..a1b4432e85 100644
--- a/lib/std/compress/lzma/test.zig
+++ b/lib/std/compress/lzma/test.zig
@@ -18,7 +18,14 @@ fn testDecompressEqual(expected: []const u8, compressed: []const u8) !void {
 }
 
 fn testDecompressError(expected: anyerror, compressed: []const u8) !void {
-    return std.testing.expectError(expected, testDecompress(compressed));
+    const gpa = std.testing.allocator;
+    var stream: std.Io.Reader = .fixed(compressed);
+
+    var decompressor = try lzma.Decompress.initOptions(&stream, gpa, &.{}, .{}, std.math.maxInt(u32));
+    defer decompressor.deinit();
+
+    try std.testing.expectError(error.ReadFailed, decompressor.reader.allocRemaining(gpa, .unlimited));
+    try std.testing.expectEqual(expected, decompressor.err orelse return error.TestFailed);
 }
 
 test "decompress empty world" {
@@ -76,14 +83,14 @@ test "known size with end of payload marker" {
 
 test "too big uncompressed size in header" {
     try testDecompressError(
-        error.CorruptInput,
+        error.DecompressedSizeMismatch,
         @embedFile("testdata/bad-too_big_size-with_eopm.lzma"),
     );
 }
 
 test "too small uncompressed size in header" {
     try testDecompressError(
-        error.CorruptInput,
+        error.DecompressedSizeMismatch,
         @embedFile("testdata/bad-too_small_size-without_eopm-3.lzma"),
     );
 }