diff --git a/pedalboard/ExternalPlugin.h b/pedalboard/ExternalPlugin.h
index 14a52d8f..5344bb70 100644
--- a/pedalboard/ExternalPlugin.h
+++ b/pedalboard/ExternalPlugin.h
@@ -649,7 +649,7 @@ template <typename ExternalPluginType> class ExternalPlugin : public Plugin {
       // To compensate for any latency added by the plugin,
       // only tell Pedalboard to use the last _n_ samples.
       long usableSamplesProduced =
-          samplesProvided - pluginInstance->getLatencySamples();
+          std::max(0L, samplesProvided - pluginInstance->getLatencySamples());
       return static_cast<int>(
           std::min(usableSamplesProduced, (long)outputBlock.getNumSamples()));
     }
diff --git a/pedalboard/process.h b/pedalboard/process.h
index c34e9aa2..329aab9b 100644
--- a/pedalboard/process.h
+++ b/pedalboard/process.h
@@ -317,6 +317,11 @@ process<float>(const py::array_t<float, py::array::c_style> inputArray,
         juce::dsp::ProcessContextReplacing<float> context(ioBlock);
 
         int outputSamples = plugin->process(context);
+        if (outputSamples < 0) {
+          throw std::runtime_error(
+              "A plugin returned a negative number of output samples! "
+              "This is an internal Pedalboard error and should be reported.");
+        }
         pluginSamplesReceived += outputSamples;
 
         int missingSamples = blockSize - outputSamples;
diff --git a/tests/test_external_plugins.py b/tests/test_external_plugins.py
index 6503d31a..3a5448e6 100644
--- a/tests/test_external_plugins.py
+++ b/tests/test_external_plugins.py
@@ -630,7 +630,7 @@ def test_parameter_name_normalization(_input: str, expected: str):
 
 
 @pytest.mark.skipif(not plugin_named("CHOWTapeModel"), reason="Missing CHOWTapeModel plugin.")
-@pytest.mark.parametrize("buffer_size", [128, 8192, 65536])
+@pytest.mark.parametrize("buffer_size", [16, 128, 8192, 65536])
 @pytest.mark.parametrize("oversampling", [1, 2, 4, 8, 16])
 def test_external_plugin_latency_compensation(buffer_size: int, oversampling: int):
     """