diff --git a/src/Conversion.cpp b/src/Conversion.cpp
index a0ac3c1e91..7f9de9029b 100644
--- a/src/Conversion.cpp
+++ b/src/Conversion.cpp
@@ -42,13 +42,6 @@ bool u160ToHuman(uint160& buf, std::string& retStr)
 
 #endif
 
-base_uint160 uint256::to160() const
-{
- uint160 m;
- memcpy(m.begin(), begin(), m.size());
- return m;
-}
-
 base_uint256 uint160::to256() const
 {
  uint256 m;
diff --git a/src/uint256.h b/src/uint256.h
index 3e89222070..a13c814dc3 100644
--- a/src/uint256.h
+++ b/src/uint256.h
@@ -511,8 +511,6 @@ public:
 			zero();
 		}
 	}
-
-	base_uint160 to160() const;
 };