diff --git a/libc/decl/errno_values.h b/libc/decl/errno_values.h
index 5ad23467..4a2abc24 100644
--- a/libc/decl/errno_values.h
+++ b/libc/decl/errno_values.h
@@ -54,6 +54,7 @@
 #define EDOM 62
 #define EINPROGRESS 63
 #define EALREADY 64
+#define ESHUTDOWN 65
 
 #define EOPNOTSUPP ENOTSUP
 
diff --git a/libc/strerror.cpp b/libc/strerror.cpp
index ad986cd2..ea6bcbf3 100644
--- a/libc/strerror.cpp
+++ b/libc/strerror.cpp
@@ -83,6 +83,7 @@ extern "C" const char* sortix_strerror(int errnum)
 	case EDOM: return "Mathematics argument out of domain of function";
 	case EINPROGRESS: return "Operation in progress";
 	case EALREADY: return "Connection already in progress";
+	case ESHUTDOWN: return "Cannot send after transport endpoint shutdown";
 	default: return "Unknown error condition";
 	}
 }