diff --git a/include/realizations/catchment/Bmi_C_Formulation.hpp b/include/realizations/catchment/Bmi_C_Formulation.hpp
index fd0f010ef8..d43db59d97 100644
--- a/include/realizations/catchment/Bmi_C_Formulation.hpp
+++ b/include/realizations/catchment/Bmi_C_Formulation.hpp
@@ -100,8 +100,6 @@ namespace realization {
          */
         bool is_model_initialized() override;
 
-        friend class Bmi_Multi_Formulation;
-
         // Unit test access
         friend class ::Bmi_Formulation_Test;
         friend class ::Bmi_C_Formulation_Test;
diff --git a/include/realizations/catchment/Bmi_Cpp_Formulation.hpp b/include/realizations/catchment/Bmi_Cpp_Formulation.hpp
index b8d0dd7f8c..8ec1c55b35 100644
--- a/include/realizations/catchment/Bmi_Cpp_Formulation.hpp
+++ b/include/realizations/catchment/Bmi_Cpp_Formulation.hpp
@@ -40,10 +40,6 @@ namespace realization {
 
         bool is_model_initialized() override;
 
-                protected:
-
-        friend class Bmi_Multi_Formulation;
-
         // Unit test access
         friend class ::Bmi_Formulation_Test;
         friend class ::Bmi_Cpp_Formulation_Test;
diff --git a/include/realizations/catchment/Bmi_Fortran_Formulation.hpp b/include/realizations/catchment/Bmi_Fortran_Formulation.hpp
index 112851e15c..7c9630f4e1 100644
--- a/include/realizations/catchment/Bmi_Fortran_Formulation.hpp
+++ b/include/realizations/catchment/Bmi_Fortran_Formulation.hpp
@@ -45,8 +45,6 @@ namespace realization {
 
         double get_var_value_as_double(const int &index, const std::string &var_name) override;
 
-        friend class Bmi_Multi_Formulation;
-
         // Unit test access
         friend class ::Bmi_Multi_Formulation_Test;
         friend class ::Bmi_Formulation_Test;
diff --git a/include/realizations/catchment/Bmi_Py_Formulation.hpp b/include/realizations/catchment/Bmi_Py_Formulation.hpp
index 644648c208..b67e71321e 100644
--- a/include/realizations/catchment/Bmi_Py_Formulation.hpp
+++ b/include/realizations/catchment/Bmi_Py_Formulation.hpp
@@ -55,8 +55,6 @@ namespace realization {
          */
         bool is_model_initialized() override;
 
-        friend class Bmi_Multi_Formulation;
-
         // Unit test access
         friend class ::Bmi_Formulation_Test;
         friend class ::Bmi_Py_Formulation_Test;