diff --git a/sim/rx/ChangeLog b/sim/rx/ChangeLog
index d453bed46e..f064039582 100644
--- a/sim/rx/ChangeLog
+++ b/sim/rx/ChangeLog
@@ -1,3 +1,7 @@
+2021-02-08  Andrew Burgess  <andrew.burgess@embecosm.com>
+
+	* gdb-if.c (sim_memory_map): New function.
+
 2021-02-06  Mike Frysinger  <vapier@gentoo.org>
 
 	* configure: Regenerate.
diff --git a/sim/rx/gdb-if.c b/sim/rx/gdb-if.c
index 63705f9bb0..6f8bfbd1c5 100644
--- a/sim/rx/gdb-if.c
+++ b/sim/rx/gdb-if.c
@@ -854,3 +854,11 @@ sim_complete_command (SIM_DESC sd, const char *text, const char *word)
 {
   return NULL;
 }
+
+/* Stub this out for now.  */
+
+char *
+sim_memory_map (SIM_DESC sd)
+{
+  return NULL;
+}