diff --git a/timeside/plugins/analyzer/externals/vamp_spectral_kurtosis.py b/timeside/plugins/analyzer/externals/vamp_spectral_kurtosis.py
index <HASH>..<HASH> 100644
--- a/timeside/plugins/analyzer/externals/vamp_spectral_kurtosis.py
+++ b/timeside/plugins/analyzer/externals/vamp_spectral_kurtosis.py
@@ -45,6 +45,8 @@ class VampSpectralKurtosis(VampAnalyzer):
     @store_parameters
     def __init__(self):
         super(VampSpectralKurtosis, self).__init__()
+        self.input_blocksize = 1024
+        self.input_stepsize = self.input_blocksize
         # Define Vamp plugin key and output
         self.plugin_key = 'vamp-libxtract:spectral_kurtosis'
         self.plugin_output = 'spectral_kurtosis'
[analyzers] set VampSpectralKurtosis blocksize to <I> (see #<I>)