diff --git a/libc/isystem/stdnoreturn.h b/libc/isystem/stdnoreturn.h
new file mode 100644
index 00000000..216c41bf
--- /dev/null
+++ b/libc/isystem/stdnoreturn.h
@@ -0,0 +1,10 @@
+#ifndef LIBC_ISYSTEM_STDNORETURN_H_
+#define LIBC_ISYSTEM_STDNORETURN_H_
+
+COSMOPOLITAN_C_START_
+
+#define noreturn wontreturn
+
+COSMOPOLITAN_C_END_
+
+#endif