diff --git a/src/exception.cpp b/src/exception.cpp
index df0baa5..f44cdaa 100644
--- a/src/exception.cpp
+++ b/src/exception.cpp
@@ -14,6 +14,9 @@
 namespace exception
 {
 
+void exception::unused() const noexcept
+{}
+
 int generated_exception::get_errno() const noexcept
 {
     return EIO;