diff --git a/include/nonius/param.h++ b/include/nonius/param.h++
index b0d7bf3..4fa1076 100644
--- a/include/nonius/param.h++
+++ b/include/nonius/param.h++
@@ -100,7 +100,7 @@ public:
     friend bool operator==(const param& x, const param& y) { return x.impl_->eq(y); }
 
     param parse(std::string const& s) const {
-        auto ss = std::stringstream{s};
+        std::stringstream ss{s};
         auto cpy = *this;
         ss.exceptions(std::ios::failbit);
         ss >> cpy;