diff --git a/tools/qa/cppunit/test_bigint.cxx b/tools/qa/cppunit/test_bigint.cxx
index 9832a23cb278..3e2654b1adf6 100644
--- a/tools/qa/cppunit/test_bigint.cxx
+++ b/tools/qa/cppunit/test_bigint.cxx
@@ -87,7 +87,7 @@ void BigIntTest::testConstructionFromLongLong()
 
     // positive number not fitting to long
     {
-        BigInt bi(static_cast<sal_Int64>(std::numeric_limits<long>::max() + 1));
+        BigInt bi(static_cast<sal_Int64>(std::numeric_limits<long>::max()) + 1);
         CPPUNIT_ASSERT(bi.IsSet());
         CPPUNIT_ASSERT(!bi.IsZero());
         CPPUNIT_ASSERT(!bi.IsNeg());
@@ -96,7 +96,7 @@ void BigIntTest::testConstructionFromLongLong()
 
     // negative number not fitting to long
     {
-        BigInt bi(static_cast<sal_Int64>(std::numeric_limits<long>::min() - 1));
+        BigInt bi(static_cast<sal_Int64>(std::numeric_limits<long>::min()) - 1);
         CPPUNIT_ASSERT(bi.IsSet());
         CPPUNIT_ASSERT(!bi.IsZero());
         CPPUNIT_ASSERT(bi.IsNeg());