diff --git a/src/cpp/ripple/uint256.h b/src/cpp/ripple/uint256.h
index 3ec6c45d4..eb74f0f5e 100644
--- a/src/cpp/ripple/uint256.h
+++ b/src/cpp/ripple/uint256.h
@@ -425,6 +425,7 @@ public:
 	{
 		if (pn != b.pn)
 			memcpy(pn, b.pn, sizeof(pn));
+		return *this;
 	}
 
 	uint256(uint64 b)