diff --git a/gdb/cli/cli-setshow.c b/gdb/cli/cli-setshow.c
index 07233e36a380..ecb739b94e90 100644
--- a/gdb/cli/cli-setshow.c
+++ b/gdb/cli/cli-setshow.c
@@ -21,6 +21,7 @@
 #include <ctype.h>
 #include "arch-utils.h"
 #include "observable.h"
+#include "interps.h"
 
 #include "ui-out.h"
 
@@ -521,18 +522,18 @@ do_set_command (const char *arg, int from_tty, struct cmd_list_element *c)
 	case var_string_noescape:
 	case var_filename:
 	case var_optional_filename:
-	  gdb::observers::command_param_changed.notify
+	  interps_notify_param_changed
 	    (name, c->var->get<std::string> ().c_str ());
 	  break;
 	case var_enum:
-	  gdb::observers::command_param_changed.notify
+	  interps_notify_param_changed
 	    (name, c->var->get<const char *> ());
 	  break;
 	case var_boolean:
 	  {
 	    const char *opt = c->var->get<bool> () ? "on" : "off";
 
-	    gdb::observers::command_param_changed.notify (name, opt);
+	    interps_notify_param_changed (name, opt);
 	  }
 	  break;
 	case var_auto_boolean:
@@ -540,7 +541,7 @@ do_set_command (const char *arg, int from_tty, struct cmd_list_element *c)
 	    const char *s
 	      = auto_boolean_enums[c->var->get<enum auto_boolean> ()];
 
-	    gdb::observers::command_param_changed.notify (name, s);
+	    interps_notify_param_changed (name, s);
 	  }
 	  break;
 	case var_uinteger:
@@ -548,7 +549,7 @@ do_set_command (const char *arg, int from_tty, struct cmd_list_element *c)
 	    char s[64];
 
 	    xsnprintf (s, sizeof s, "%u", c->var->get<unsigned int> ());
-	    gdb::observers::command_param_changed.notify (name, s);
+	    interps_notify_param_changed (name, s);
 	  }
 	  break;
 	case var_integer:
@@ -557,7 +558,7 @@ do_set_command (const char *arg, int from_tty, struct cmd_list_element *c)
 	    char s[64];
 
 	    xsnprintf (s, sizeof s, "%d", c->var->get<int> ());
-	    gdb::observers::command_param_changed.notify (name, s);
+	    interps_notify_param_changed (name, s);
 	  }
 	  break;
 	}
diff --git a/gdb/interps.c b/gdb/interps.c
index d572f92f4aa0..3cb89b113a3b 100644
--- a/gdb/interps.c
+++ b/gdb/interps.c
@@ -583,6 +583,14 @@ interps_notify_breakpoint_modified (breakpoint *b)
   interps_notify (&interp::on_breakpoint_modified, b);
 }
 
+/* See interps.h.  */
+
+void
+interps_notify_param_changed (const char *param, const char *value)
+{
+  interps_notify (&interp::on_param_changed, param, value);
+}
+
 /* This just adds the "interpreter-exec" command.  */
 void _initialize_interpreter ();
 void
diff --git a/gdb/interps.h b/gdb/interps.h
index 6fda2ba372f1..948b6f520df0 100644
--- a/gdb/interps.h
+++ b/gdb/interps.h
@@ -175,6 +175,9 @@ class interp : public intrusive_list_node<interp>
   /* Notify the interpreter that breakpoint B was modified.  */
   virtual void on_breakpoint_modified (breakpoint *b) {}
 
+  /* Notify the interpreter that parameter PARAM changed to VALUE.  */
+  virtual void on_param_changed (const char *param, const char *value) {}
+
 private:
   /* The memory for this is static, it comes from literal strings (e.g. "cli").  */
   const char *m_name;
@@ -353,6 +356,9 @@ extern void interps_notify_breakpoint_deleted (breakpoint *b);
 /* Notify all interpreters that breakpoint B was modified.  */
 extern void interps_notify_breakpoint_modified (breakpoint *b);
 
+/* Notify all interpreters that parameter PARAM changed to VALUE.  */
+extern void interps_notify_param_changed (const char *param, const char *value);
+
 /* well-known interpreters */
 #define INTERP_CONSOLE		"console"
 #define INTERP_MI2             "mi2"
diff --git a/gdb/mi/mi-interp.c b/gdb/mi/mi-interp.c
index 2e30b15a4862..c6e70a779648 100644
--- a/gdb/mi/mi-interp.c
+++ b/gdb/mi/mi-interp.c
@@ -60,7 +60,6 @@ static int mi_interp_query_hook (const char *ctlstr, va_list ap)
 static void mi_insert_notify_hooks (void);
 static void mi_remove_notify_hooks (void);
 
-static void mi_command_param_changed (const char *param, const char *value);
 static void mi_memory_changed (struct inferior *inf, CORE_ADDR memaddr,
 			       ssize_t len, const bfd_byte *myaddr);
 
@@ -792,36 +791,25 @@ mi_interp::on_solib_unloaded (so_list *solib)
   gdb_flush (this->event_channel);
 }
 
-/* Emit notification about the command parameter change.  */
-
-static void
-mi_command_param_changed (const char *param, const char *value)
+void
+mi_interp::on_param_changed (const char *param, const char *value)
 {
   if (mi_suppress_notification.cmd_param_changed)
     return;
 
-  SWITCH_THRU_ALL_UIS ()
-    {
-      struct mi_interp *mi = as_mi_interp (top_level_interpreter ());
-      struct ui_out *mi_uiout;
-
-      if (mi == NULL)
-	continue;
-
-      mi_uiout = top_level_interpreter ()->interp_ui_out ();
+  ui_out *mi_uiout = this->interp_ui_out ();
 
-      target_terminal::scoped_restore_terminal_state term_state;
-      target_terminal::ours_for_output ();
+  target_terminal::scoped_restore_terminal_state term_state;
+  target_terminal::ours_for_output ();
 
-      gdb_printf (mi->event_channel, "cmd-param-changed");
+  gdb_printf (this->event_channel, "cmd-param-changed");
 
-      ui_out_redirect_pop redir (mi_uiout, mi->event_channel);
+  ui_out_redirect_pop redir (mi_uiout, this->event_channel);
 
-      mi_uiout->field_string ("param", param);
-      mi_uiout->field_string ("value", value);
+  mi_uiout->field_string ("param", param);
+  mi_uiout->field_string ("value", value);
 
-      gdb_flush (mi->event_channel);
-    }
+  gdb_flush (this->event_channel);
 }
 
 /* Emit notification about the target memory change.  */
@@ -972,7 +960,5 @@ _initialize_mi_interp ()
   interp_factory_register (INTERP_MI4, mi_interp_factory);
   interp_factory_register (INTERP_MI, mi_interp_factory);
 
-  gdb::observers::command_param_changed.attach (mi_command_param_changed,
-						"mi-interp");
   gdb::observers::memory_changed.attach (mi_memory_changed, "mi-interp");
 }
diff --git a/gdb/mi/mi-interp.h b/gdb/mi/mi-interp.h
index 52cce4c7cf4c..51f22b2ef112 100644
--- a/gdb/mi/mi-interp.h
+++ b/gdb/mi/mi-interp.h
@@ -69,6 +69,7 @@ class mi_interp final : public interp
   void on_breakpoint_created (breakpoint *b) override;
   void on_breakpoint_deleted (breakpoint *b) override;
   void on_breakpoint_modified (breakpoint *b) override;
+  void on_param_changed (const char *param, const char *value) override;
 
   /* MI's output channels */
   mi_console_file *out;
diff --git a/gdb/observable.c b/gdb/observable.c
index 3535e69f7f54..a18b863fb471 100644
--- a/gdb/observable.c
+++ b/gdb/observable.c
@@ -61,7 +61,6 @@ DEFINE_OBSERVABLE (inferior_removed);
 DEFINE_OBSERVABLE (memory_changed);
 DEFINE_OBSERVABLE (before_prompt);
 DEFINE_OBSERVABLE (gdb_datadir_changed);
-DEFINE_OBSERVABLE (command_param_changed);
 DEFINE_OBSERVABLE (inferior_call_pre);
 DEFINE_OBSERVABLE (inferior_call_post);
 DEFINE_OBSERVABLE (register_changed);
diff --git a/gdb/observable.h b/gdb/observable.h
index 1c7ba0a1ba67..f6047a239cd6 100644
--- a/gdb/observable.h
+++ b/gdb/observable.h
@@ -183,13 +183,6 @@ extern observable<const char */* current_prompt */> before_prompt;
    change.  */
 extern observable<> gdb_datadir_changed;
 
-/* The parameter of some 'set' commands in console are changed.
-   This method is called after a command 'set param value'.  PARAM
-   is the parameter of 'set' command, and VALUE is the value of
-   changed parameter.  */
-extern observable<const char */* param */, const char */* value */>
-    command_param_changed;
-
 /* An inferior function at ADDRESS is about to be called in thread
    THREAD.  */
 extern observable<ptid_t /* thread */, CORE_ADDR /* address */>
diff --git a/gdb/source.c b/gdb/source.c
index 4d297c82ea9c..d0bb3c126f3e 100644
--- a/gdb/source.c
+++ b/gdb/source.c
@@ -51,6 +51,7 @@
 #include "build-id.h"
 #include "debuginfod-support.h"
 #include "gdbsupport/buildargv.h"
+#include "interps.h"
 
 #define OPEN_MODE (O_RDONLY | O_BINARY)
 #define FDOPEN_MODE FOPEN_RB
@@ -462,8 +463,8 @@ directory_command (const char *dirname, int from_tty)
     }
   if (value_changed)
     {
-      gdb::observers::command_param_changed.notify ("directories",
-						    source_path.c_str ());
+      interps_notify_param_changed ("directories", source_path.c_str ());
+
       if (from_tty)
 	show_directories_1 (gdb_stdout, (char *) 0, from_tty);
     }
