diff --git a/firecrown/likelihood/likelihood.py b/firecrown/likelihood/likelihood.py
index 0945174f3..7b466f77c 100644
--- a/firecrown/likelihood/likelihood.py
+++ b/firecrown/likelihood/likelihood.py
@@ -36,9 +36,9 @@ class Likelihood(Updatable):
     these methods, and provide other abstract methods for their subclasses to implement.
     """
 
-    def __init__(self) -> None:
+    def __init__(self, parameter_prefix: Optional[str] = None) -> None:
         """Default initialization for a base Likelihood object."""
-        super().__init__()
+        super().__init__(parameter_prefix=parameter_prefix)
 
         self.predicted_data_vector: Optional[npt.NDArray[np.double]] = None
         self.measured_data_vector: Optional[npt.NDArray[np.double]] = None
diff --git a/tests/connector/cobaya/test_model_likelihood.py b/tests/connector/cobaya/test_model_likelihood.py
index 7c50a928a..c6446544d 100644
--- a/tests/connector/cobaya/test_model_likelihood.py
+++ b/tests/connector/cobaya/test_model_likelihood.py
@@ -214,7 +214,7 @@ def test_sampler_parameter_likelihood_missing(fiducial_params):
             "lk_connector": {
                 "external": LikelihoodConnector,
                 "firecrownIni": "tests/likelihood/lkdir/lk_sampler_parameter.py",
-                "build_parameters": NamedParameters({"sacc_tracer": "my_prefix"}),
+                "build_parameters": NamedParameters({"parameter_prefix": "my_prefix"}),
             }
         },
         "theory": {
@@ -235,7 +235,7 @@ def test_sampler_parameter_likelihood(fiducial_params):
             "lk_connector": {
                 "external": LikelihoodConnector,
                 "firecrownIni": "tests/likelihood/lkdir/lk_sampler_parameter.py",
-                "build_parameters": NamedParameters({"sacc_tracer": "my_prefix"}),
+                "build_parameters": NamedParameters({"parameter_prefix": "my_prefix"}),
             }
         },
         "theory": {
diff --git a/tests/likelihood/lkdir/lk_sampler_parameter.py b/tests/likelihood/lkdir/lk_sampler_parameter.py
index 5bc943c9b..32a3772b9 100644
--- a/tests/likelihood/lkdir/lk_sampler_parameter.py
+++ b/tests/likelihood/lkdir/lk_sampler_parameter.py
@@ -1,6 +1,6 @@
 """
 Provides a trivial likelihood factory function for testing purposes.
-The likelihood created requires a string parameter named "sacc_tracer"
+The likelihood created requires a string parameter named "parameter_prefix"
 and has a sampler parameter named "sampler_param0".
 """
 from firecrown.likelihood.likelihood import NamedParameters
diff --git a/tests/likelihood/lkdir/lkmodule.py b/tests/likelihood/lkdir/lkmodule.py
index d18a46f34..76d46a195 100644
--- a/tests/likelihood/lkdir/lkmodule.py
+++ b/tests/likelihood/lkdir/lkmodule.py
@@ -54,10 +54,9 @@ class SamplerParameterLikelihood(Likelihood):
 
     def __init__(self, params: NamedParameters):
         """Initialize the SamplerParameterLikelihood by reading the specificed
-        sacc_tracer value and creates a sampler parameter called "sampler_param0".
+        parameter_prefix value and creates a sampler parameter called "sampler_param0".
         """
-        super().__init__()
-        self.sacc_tracer = params.get_string("sacc_tracer")
+        super().__init__(parameter_prefix=params.get_string("parameter_prefix"))
         self.sampler_param0 = parameters.create()
 
     def read(self, sacc_data: sacc.Sacc) -> None: