diff --git a/client/speed.js b/client/speed.js
index c5a6abc..0cff410 100644
--- a/client/speed.js
+++ b/client/speed.js
@@ -70,7 +70,7 @@ function do_lod_wasm(state, context) {
 
     // copy result back
     const wasm_segments = new Uint32Array(state.wasm.exports.memory.buffer, segments, segment_count);
-    const wasm_segments_from = new Uint32Array(state.wasm.exports.memory.buffer, segments_from, context.clipped_indices.size);
+    const wasm_segments_from = new Uint32Array(state.wasm.exports.memory.buffer, segments_from, context.clipped_indices.size + 1);
 
     state.segments.data.set(wasm_segments);
     state.segments.size = segment_count;