diff --git a/test/libsolidity/util/BytesUtils.cpp b/test/libsolidity/util/BytesUtils.cpp
index fd2cd2fcf..7416ca9a2 100644
--- a/test/libsolidity/util/BytesUtils.cpp
+++ b/test/libsolidity/util/BytesUtils.cpp
@@ -22,6 +22,7 @@
 
 #include <liblangutil/Common.h>
 
+#include <libsolutil/CommonData.h>
 #include <libsolutil/StringUtils.h>
 
 #include <boost/algorithm/string.hpp>
@@ -198,8 +199,7 @@ string BytesUtils::formatString(bytes const& _bytes, size_t _cutOff)
 				if (isprint(v))
 					os << v;
 				else
-					os << "\\x" << setw(2) << setfill('0') << hex << v;
-
+					os << "\\x" << toHex(v);
 		}
 	}
 	os << "\"";