diff --git a/decoder.cpp b/decoder.cpp
index 0a3bf58..450762c 100644
--- a/decoder.cpp
+++ b/decoder.cpp
@@ -96,7 +96,7 @@ emscripten::val Decoder::decode(uint32_t count)
             for (int j = 0; j < samplesPerFrame; ++j) {
                 for (int k = 0; k < channels; ++k) {
                     float value = mad_f_todouble(synth->pcm.samples[k][j]);
-                    chans[k].set(std::to_string(success * samplesPerFrame + j), emscripten::val(value));
+                    chans[k].set(std::to_string(i * samplesPerFrame + j), emscripten::val(value));
                 }
             }
         }