diff --git a/src/err.cpp b/src/err.cpp
index e2363be8..a9634450 100644
--- a/src/err.cpp
+++ b/src/err.cpp
@@ -59,6 +59,8 @@ const char *zmq::errno_to_string (int errno_)
         return "Context was terminated";
     case EMTHREAD:
         return "No thread available";
+    case EHOSTUNREACH:
+        return "Host unreachable";
     default:
 #if defined _MSC_VER
 #pragma warning (push)