diff --git a/include/hal_core/netlist/boolean_function/types.h b/include/hal_core/netlist/boolean_function/types.h
index 16ac6f4fcd6..3357839ad90 100644
--- a/include/hal_core/netlist/boolean_function/types.h
+++ b/include/hal_core/netlist/boolean_function/types.h
@@ -270,7 +270,7 @@ namespace hal
 			 * @param[in] bf - Boolean function to evaluate.
 			 * @returns Ok() and the evaluated function on success, Err() otherwise.
 			 */
-            Result<BooleanFunction> evaluate(const BooleanFunction& bf);
+            Result<BooleanFunction> evaluate(const BooleanFunction& bf) const;
         };
 
         /**
diff --git a/src/netlist/boolean_function/types.cpp b/src/netlist/boolean_function/types.cpp
index 8fb8f95d3af..9d33e7ddcc6 100644
--- a/src/netlist/boolean_function/types.cpp
+++ b/src/netlist/boolean_function/types.cpp
@@ -209,7 +209,7 @@ namespace hal
             return out;
         }
 
-        Result<BooleanFunction> Model::evaluate(const BooleanFunction& bf)
+        Result<BooleanFunction> Model::evaluate(const BooleanFunction& bf) const
         {
             std::vector<BooleanFunction::Node> new_nodes;