diff --git a/libuavcan_drivers/linux/include/uavcan_linux/exception.hpp b/libuavcan_drivers/linux/include/uavcan_linux/exception.hpp
index e6fc8ba111..394da2a816 100644
--- a/libuavcan_drivers/linux/include/uavcan_linux/exception.hpp
+++ b/libuavcan_drivers/linux/include/uavcan_linux/exception.hpp
@@ -17,15 +17,15 @@ class Exception : public std::runtime_error
 {
     const int errno_;
 
-    static std::string makeErrorString(const std::string& descr)
+    static std::string makeErrorString(const std::string& descr, int use_errno)
     {
-        return descr + " [errno " + std::to_string(errno) + " \"" + std::strerror(errno) + "\"]";
+        return descr + " [errno " + std::to_string(use_errno) + " \"" + std::strerror(use_errno) + "\"]";
     }
 
 public:
-    explicit Exception(const std::string& descr)
-        : std::runtime_error(makeErrorString(descr))
-        , errno_(errno)
+    explicit Exception(const std::string& descr, int use_errno = errno)
+        : std::runtime_error(makeErrorString(descr, use_errno))
+        , errno_(use_errno)
     { }
 
     /**
@@ -41,7 +41,7 @@ public:
 class AllIfacesDownException : public Exception
 {
 public:
-    AllIfacesDownException() : Exception("All ifaces are down") { }
+    AllIfacesDownException() : Exception("All ifaces are down", ENETDOWN) { }
 };
 
 }