diff --git a/effectful/handlers/minipyro.py b/effectful/handlers/minipyro.py
index e2f4d17d..e9c17890 100644
--- a/effectful/handlers/minipyro.py
+++ b/effectful/handlers/minipyro.py
@@ -393,7 +393,7 @@ def __call__(self, model, guide, *args):
         # On first call, initialize params and save their names.
         if self._param_trace is None:
             with block(), trace() as tr, block(
-                hide_fn=lambda op, *_, **__: op == param
+                hide_fn=lambda op, *_, **__: op != param
             ):
                 elbo(model, guide, *args)
             self._param_trace = tr
@@ -415,8 +415,9 @@ def compiled(*params_and_args):
                 ):
                     constrained_param = param(name)  # assume param has been initialized
                     assert constrained_param.unconstrained() is unconstrained_param
-                    self._param_trace[name]["value"] = constrained_param
-                return replay(elbo, guide_trace=self._param_trace)(model, guide, *args)
+                    self._param_trace[name].value = constrained_param
+                with replay(self._param_trace):
+                    return elbo(model, guide, *args)
 
             with validation_enabled(False), warnings.catch_warnings():
                 if self.ignore_jit_warnings: