diff --git a/kymata/gridsearch/plain.py b/kymata/gridsearch/plain.py
index a8a8cd0e..4ba300c2 100755
--- a/kymata/gridsearch/plain.py
+++ b/kymata/gridsearch/plain.py
@@ -188,6 +188,8 @@ def do_gridsearch(
     else:
         raise NotImplementedError(channel_space)
 
+    del corrs, auto_corrs, function, latencies_ms, log_pvalues
+
     return es