diff --git a/caimira/apps/calculator/model_generator.py b/caimira/apps/calculator/model_generator.py
index 38110bb7..4a305418 100644
--- a/caimira/apps/calculator/model_generator.py
+++ b/caimira/apps/calculator/model_generator.py
@@ -413,7 +413,7 @@ class VirusFormData(FormData):
         expiration_defn = self.data_registry.population_scenario_activity[self.activity_type]['expiration']
         if (self.activity_type == 'smallmeeting'):
             # Conversation of N people is approximately 1/N% of the time speaking.
-            expiration_defn['Breathing'] = self.total_people - 1
+            expiration_defn = {'Speaking': 1, 'Breathing': self.total_people - 1}
         elif (self.activity_type == 'precise'):
             activity_defn, expiration_defn = self.generate_precise_activity_expiration()
 
diff --git a/caimira/store/data_registry.py b/caimira/store/data_registry.py
index 5f15680a..5e708fd2 100644
--- a/caimira/store/data_registry.py
+++ b/caimira/store/data_registry.py
@@ -443,7 +443,7 @@ class DataRegistry:
             "activity": "Seated",
             "expiration": {"Breathing": 1, "Speaking": 9},
         },
-        "precise": {},
+        "precise": {"activity": "", "expiration": {}},
     }
 
     def update(self, data, version=None):