diff --git a/tests/crypto/bigint_test.cpp b/tests/crypto/bigint_test.cpp
index 833c5f4..0d983b3 100644
--- a/tests/crypto/bigint_test.cpp
+++ b/tests/crypto/bigint_test.cpp
@@ -46,6 +46,10 @@ BOOST_AUTO_TEST_CASE(bigint_test_2)
         BOOST_CHECK( bi_accu >= a_1 );
     } while ( bi_accu.log2() <= 128 );
 
+    // Test self-assignment (a=a) has no effect, but throw in some arcanity to avoid a compiler warning
+    const volatile auto* bi_accu_self = &bi_accu;
+    bi_accu = const_cast<fc::bigint&>(*bi_accu_self);
+
     BOOST_CHECK( bi_accu && !bi_accu.is_negative() && bi_accu != bi_1 );
 
     BOOST_CHECK( bi_3.exp( bi_accu.log2() ) > bi_accu );