diff --git a/crates/conjure_core/src/solver/adaptors/rustsat.rs b/crates/conjure_core/src/solver/adaptors/rustsat.rs
index f771bb14ae..376e4840d0 100644
--- a/crates/conjure_core/src/solver/adaptors/rustsat.rs
+++ b/crates/conjure_core/src/solver/adaptors/rustsat.rs
@@ -106,9 +106,9 @@ pub fn instantiate_model_from_conjure(
     Ok(inst)
 }
 
-fn solve(&mut solver_inst: Minisat, model_inst: Option<SatInstance>) -> bool {
+fn solve(&mut solver_inst: Minisat, model_inst: SatInstance) -> bool {
 
-    let cnf_func: rustsat::instances::Cnf = model_inst.clone().unwrap().into_cnf().0;
+    let cnf_func: rustsat::instances::Cnf = model_inst.clone().into_cnf().0;
     solver_inst.add_cnf(cnf_func);
     let res = solver_inst.solve().unwrap();
 
@@ -117,7 +117,7 @@ fn solve(&mut solver_inst: Minisat, model_inst: Option<SatInstance>) -> bool {
         SolverResult::Unsat => false,
     
         // should not arise:
-        SolverResult::Interrupted => panic!((format!("SatInstance may be invalid, Interrupted."))),
+        SolverResult::Interrupted => panic!("SatInstance may be invalid, Interrupted."),
     };
 
     solver_res
@@ -134,7 +134,7 @@ impl SolverAdaptor for SAT {
         // &self.solver_inst.add_cnf(cnf_func);
         // let res = &self.solver_inst.solve().unwrap();
 
-        let solver_res = solve(self.solver_inst, self.model_inst);
+        let solver_res = solve(&mut self.solver_inst, self.model_inst.unwrap());
 
         // error thrown always. impermanent
         // will eventually have a SolveSucess instance being returned with Ok(), when the implementation is more permanent.