diff --git a/cdf_compare.py b/cdf_compare.py
index e07ec34..6b09604 100755
--- a/cdf_compare.py
+++ b/cdf_compare.py
@@ -185,6 +185,7 @@ if __name__ == "__main__":
             cc_algo=cc_algo,
             transmission_direction=transmission_direction
         ))
+        del transmission_df
 
     # Plot sRTT CDF
     legend = list()