diff --git a/process_bigraph/experiments/minimal_gillespie.py b/process_bigraph/experiments/minimal_gillespie.py
index 48152ac..9339a0f 100644
--- a/process_bigraph/experiments/minimal_gillespie.py
+++ b/process_bigraph/experiments/minimal_gillespie.py
@@ -18,7 +18,7 @@
 
 core.register(
     'default 1', {
-        '_type': 'float',
+        '_inherit': 'float',
         '_default': 1.0})