diff --git a/io/catchiofailure.h b/io/catchiofailure.h
index 8e89b5f..be3b77b 100644
--- a/io/catchiofailure.h
+++ b/io/catchiofailure.h
@@ -8,7 +8,7 @@
 namespace IoUtilities {
 
 CPP_UTILITIES_EXPORT const char *catchIoFailure();
-CPP_UTILITIES_EXPORT void throwIoFailure(const char *what);
+[[noreturn]] CPP_UTILITIES_EXPORT void throwIoFailure(const char *what);
 } // namespace IoUtilities
 
 #endif // IOUTILITIES_CATCHIOFAILURE_H