diff --git a/winsup/cygwin/exceptions.cc b/winsup/cygwin/exceptions.cc
index b9c927ee0..22f262cc8 100644
--- a/winsup/cygwin/exceptions.cc
+++ b/winsup/cygwin/exceptions.cc
@@ -27,7 +27,7 @@ extern DWORD __sigfirst, __siglast;
 };
 
 static BOOL WINAPI ctrl_c_handler (DWORD);
-static void signal_exit (int);
+static void signal_exit (int) __attribute__ ((noreturn));
 static char windows_system_directory[1024];
 static size_t windows_system_directory_length;