diff --git a/src/sat/smt/euf_proof_checker.cpp b/src/sat/smt/euf_proof_checker.cpp
index daa775b16..158b850a5 100644
--- a/src/sat/smt/euf_proof_checker.cpp
+++ b/src/sat/smt/euf_proof_checker.cpp
@@ -243,7 +243,10 @@ namespace euf {
 
         expr_ref_vector clause(app* jst) override {
             expr_ref_vector result(m);
-            auto [pivot, proof1, proof2] = jst->args3();
+            auto x = jst->args3();
+            auto pivot  = std::get<0>(x);
+            auto proof1 = std::get<1>(x);
+            auto proof2 = std::get<2>(x);
             expr* narg;
             auto is_pivot = [&](expr* arg) {
                 if (arg == pivot)