diff --git a/gdb/tm-sun4os4.h b/gdb/tm-sun4os4.h
index f31a8c3738..971bb4fbd7 100644
--- a/gdb/tm-sun4os4.h
+++ b/gdb/tm-sun4os4.h
@@ -22,5 +22,3 @@ the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 #undef STACK_END_ADDRESS
 #define STACK_END_ADDRESS 0xf8000000
-
-#define NO_COFF