diff --git a/include/http_utility.hpp b/include/http_utility.hpp
index ce5f23e..9768526 100644
--- a/include/http_utility.hpp
+++ b/include/http_utility.hpp
@@ -47,7 +47,6 @@
     using boost::spirit::x3::parse;
     using boost::spirit::x3::space;
     using boost::spirit::x3::symbols;
-    using boost::spirit::x3::uint_;
 
     const symbols<ContentType> knownMimeType{
         {"application/cbor", ContentType::CBOR},
@@ -86,7 +85,6 @@
     using boost::spirit::x3::parse;
     using boost::spirit::x3::space;
     using boost::spirit::x3::symbols;
-    using boost::spirit::x3::uint_;
 
     const symbols<ContentType> knownMimeType{
         {"application/cbor", ContentType::CBOR},