diff --git a/pyglance/glance/compare.py b/pyglance/glance/compare.py
index 447a2dbee0799695374cb7a23b1f3626f010f33e..ca5c5a7b9db27f2bb054253fd9a5f55697a16094 100644
--- a/pyglance/glance/compare.py
+++ b/pyglance/glance/compare.py
@@ -64,7 +64,8 @@ glance_analysis_defaults = {'epsilon': 0.0,
                             'epsilon_failure_tolerance': 0.0,
                             'nonfinite_data_tolerance':  0.0,
                             'total_data_failure_tolerance': None,
-                            'minimum_acceptable_squared_correlation_coefficient': None
+                            'minimum_acceptable_squared_correlation_coefficient': None,
+                            'only_plot_on_fail': False
                             }
 
 def _clean_path(string_path) :