diff --git a/modules/beast_crypto/math/UnsignedIntegerCalc.h b/modules/beast_crypto/math/UnsignedIntegerCalc.h
index e714c0895b..5bb7f0f4f6 100644
--- a/modules/beast_crypto/math/UnsignedIntegerCalc.h
+++ b/modules/beast_crypto/math/UnsignedIntegerCalc.h
@@ -115,8 +115,10 @@ public:
             while (lo < hi)
             {
                 std::swap (*lo, *hi);
-                *lo++ = fromNetworkByteOrder <UInt> (*lo);
-                *hi-- = fromNetworkByteOrder <UInt> (*hi);
+                *lo = fromNetworkByteOrder <UInt> (*lo);
+                ++lo;
+                *hi = fromNetworkByteOrder <UInt> (*hi);
+                ++hi;
             }
             if (lo == hi)
                 *lo = fromNetworkByteOrder <UInt> (*lo);