diff --git a/src/s/sunos413.h b/src/s/sunos413.h
new file mode 100644
index 00000000000..8704d538bad
--- /dev/null
+++ b/src/s/sunos413.h
@@ -0,0 +1,5 @@
+#include "sunos4-1.h"
+
+/* The bug that corrupts GNU malloc's memory pool is fixed in SunOS 4.1.3. */
+
+#undef SYSTEM_MALLOC