diff --git a/libc/decl/errno_values.h b/libc/decl/errno_values.h
index 99a08634..75182c59 100644
--- a/libc/decl/errno_values.h
+++ b/libc/decl/errno_values.h
@@ -63,6 +63,7 @@
 #define EDESTADDRREQ 71
 #define EHOSTUNREACH 72
 #define EMSGSIZE 73
+#define ENETDOWN 74
 
 #define EOPNOTSUPP ENOTSUP
 
diff --git a/libc/strerror.cpp b/libc/strerror.cpp
index 383d0e07..67d83748 100644
--- a/libc/strerror.cpp
+++ b/libc/strerror.cpp
@@ -92,6 +92,7 @@ extern "C" const char* sortix_strerror(int errnum)
 	case EDESTADDRREQ: return "Destinatiohn address required";
 	case EHOSTUNREACH: return "Host is unreachable";
 	case EMSGSIZE: return "Message too long";
+	case ENETDOWN: return "Network is down";
 	default: return "Unknown error condition";
 	}
 }