diff --git a/gdb/xm-hp300bsd.h b/gdb/xm-hp300bsd.h
index fbbef6ffb5..db06dbc7ce 100644
--- a/gdb/xm-hp300bsd.h
+++ b/gdb/xm-hp300bsd.h
@@ -64,6 +64,8 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 /* Compensate for lack of `vprintf' function.  */
 #define MISSING_VPRINTF
 
+/* Kernel is a bit tenacious about sharing text segments, disallowing bpts.  */
+#define	ONE_PROCESS_WRITETEXT
 
 /* Interface definitions for kernel debugger KDB.  */
 
diff --git a/gdb/xm-mips.h b/gdb/xm-mips.h
index 8709a88b16..caebda5e5f 100644
--- a/gdb/xm-mips.h
+++ b/gdb/xm-mips.h
@@ -38,6 +38,9 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
 
 /* Override copies of {fetch,store}_inferior_registers in infptrace.c.  */
 #define FETCH_INFERIOR_REGISTERS
+
+/* Kernel is a bit tenacious about sharing text segments, disallowing bpts.  */
+#define	ONE_PROCESS_WRITETEXT
 
 /* Interface definitions for kernel debugger KDB */
 
diff --git a/gdb/xm-vax.h b/gdb/xm-vax.h
index 28df3cd63b..9da7306216 100644
--- a/gdb/xm-vax.h
+++ b/gdb/xm-vax.h
@@ -36,6 +36,9 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
   if (regno == AP_REGNUM) addr = blockend - 0124;	\
   if (regno == SP_REGNUM) addr = blockend - 20; }
 
+/* Kernel is a bit tenacious about sharing text segments, disallowing bpts.  */
+#define	ONE_PROCESS_WRITETEXT
+
 /* Interface definitions for kernel debugger KDB.  */
 
 /* Map machine fault codes into signal numbers.