diff --git a/src/test/arith_uint256_tests.cpp b/src/test/arith_uint256_tests.cpp
index 53ab7e95e..b19d2faea 100644
--- a/src/test/arith_uint256_tests.cpp
+++ b/src/test/arith_uint256_tests.cpp
@@ -112,7 +112,7 @@ BOOST_AUTO_TEST_CASE( basics ) // constructors, equality, inequality
     BOOST_CHECK( (R1L & arith_uint256("0xffffffffffffffff")) == arith_uint256(R1LLow64));
     BOOST_CHECK(ZeroL == arith_uint256(0));
     BOOST_CHECK(OneL == arith_uint256(1));
-    BOOST_CHECK(arith_uint256("0xffffffffffffffff") = arith_uint256(0xffffffffffffffffULL));
+    BOOST_CHECK(arith_uint256("0xffffffffffffffff") == arith_uint256(0xffffffffffffffffULL));
 
     // Assignment (from base_uint)
     arith_uint256 tmpL = ~ZeroL; BOOST_CHECK(tmpL == ~ZeroL);