diff --git a/libevmasm/LinkerObject.cpp b/libevmasm/LinkerObject.cpp
index 0ac69966e..e9c739086 100644
--- a/libevmasm/LinkerObject.cpp
+++ b/libevmasm/LinkerObject.cpp
@@ -61,7 +61,7 @@ string LinkerObject::toHex() const
 
 string LinkerObject::libraryPlaceholder(string const& _libraryName)
 {
-	return keccak256(_libraryName).hex().substr(0, 36);
+	return "0x" + keccak256(_libraryName).hex().substr(0, 34);
 }
 
 h160 const*