diff --git a/src/exception.cpp b/src/exception.cpp
index b58bd01..641659e 100644
--- a/src/exception.cpp
+++ b/src/exception.cpp
@@ -1,5 +1,6 @@
 #include <sdbusplus/exception.hpp>
 
+#include <cerrno>
 #include <stdexcept>
 #include <utility>
 
@@ -13,6 +14,11 @@
 namespace exception
 {
 
+int exception::get_errno() const noexcept
+{
+    return EIO;
+}
+
 SdBusError::SdBusError(int error, const char* prefix, SdBusInterface* intf) :
     error(SD_BUS_ERROR_NULL), intf(intf)
 {