diff --git a/src/Flare.cc b/src/Flare.cc
index 166917d914..9f00e99167 100644
--- a/src/Flare.cc
+++ b/src/Flare.cc
@@ -13,6 +13,7 @@ Flare::Flare()
 	{
 	}
 
+[[noreturn]]
 static void bad_pipe_op(const char* which, bool signal_safe)
 	{
 	if ( signal_safe )