diff --git a/src/s/sunos413.h b/src/s/sunos413.h
index 1ee0969eedf..39ade191e57 100644
--- a/src/s/sunos413.h
+++ b/src/s/sunos413.h
@@ -1,11 +1,9 @@
 #include "sunos4-1.h"
 
-#if 0 /* jik@gza.com says this didn't work.  Too bad.
-	 Can anyone find out why this loses?  */
+/* jik@gza.com says this works now.  */
 /* The bug that corrupts GNU malloc's memory pool is fixed in SunOS 4.1.3. */
 
 #undef SYSTEM_MALLOC
-#endif
 
 #if 0 /* This causes failure in process_send_signal (tcgetattr loses)
 	 and may also cause hanging at Emacs startup when parent