diff --git a/CHANGELOG.md b/CHANGELOG.md
index 144f3268..e713aa07 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,8 @@ Versioning](https://semver.org/spec/v2.0.0.html).
 
 ### Fixed
 
+- Fixed memory error that was causing playback issues with some buffer sizes in
+  Mixbus6.
 - Fixed plugin group socket name generation. This prevented plugin groups with
   the same name from being used simultaneously in multiple Wine prefixes.
 
diff --git a/src/plugin/plugin-bridge.cpp b/src/plugin/plugin-bridge.cpp
index 4b9350c3..652bdf67 100644
--- a/src/plugin/plugin-bridge.cpp
+++ b/src/plugin/plugin-bridge.cpp
@@ -512,7 +512,7 @@ void PluginBridge::process_replacing(AEffect* /*plugin*/,
     std::vector<std::vector<float>> input_buffers(
         plugin.numInputs, std::vector<float>(sample_frames));
     for (int channel = 0; channel < plugin.numInputs; channel++) {
-        std::copy(inputs[channel], inputs[channel] + sample_frames + 1,
+        std::copy(inputs[channel], inputs[channel] + sample_frames,
                   input_buffers[channel].begin());
     }