diff --git a/pyciemss/mira_integration/compiled_dynamics.py b/pyciemss/mira_integration/compiled_dynamics.py
index 9cd8748a4..806c75b1f 100644
--- a/pyciemss/mira_integration/compiled_dynamics.py
+++ b/pyciemss/mira_integration/compiled_dynamics.py
@@ -67,6 +67,9 @@ def _compile_param_values_mira(
     for param_info in src.parameters.values():
         param_name = get_name(param_info)
 
+        if param_info.placeholder:
+            continue
+
         param_dist = getattr(param_info, "distribution", None)
         if param_dist is None:
             param_value = param_info.value
diff --git a/tests/fixtures.py b/tests/fixtures.py
index e934e56b7..140f826bb 100644
--- a/tests/fixtures.py
+++ b/tests/fixtures.py
@@ -22,7 +22,7 @@
 ]
 
 STOCKFLOW_URLS = [
-    # "https://raw.githubusercontent.com/DARPA-ASKEM/Model-Representations/main/stockflow/examples/sir.json"
+    "https://raw.githubusercontent.com/DARPA-ASKEM/Model-Representations/main/stockflow/examples/sir.json"
 ]
 
 MODEL_URLS = PETRI_URLS + REGNET_URLS + STOCKFLOW_URLS