2 files changed, 12 insertions, 3 deletions
diff --git a/src/live_effects/parameter/parameter.cpp b/src/live_effects/parameter/parameter.cpp
index 70adc3084..64464f200 100644
--- a/src/live_effects/parameter/parameter.cpp
+++ b/src/live_effects/parameter/parameter.cpp
@@ -41,8 +41,6 @@ void
 Parameter::param_write_to_repr(const char * svgd)
 {
     param_effect->getRepr()->setAttribute(param_key.c_str(), svgd);
-    DocumentUndo::done(param_effect->getSPDoc(), SP_VERB_DIALOG_LIVE_PATH_EFFECT,
-               _("Updated value to scalar parameter"));
 }
 
 void Parameter::write_to_SVG(void)
@@ -73,6 +71,7 @@ ScalarParam::ScalarParam( const Glib::ustring& label, const Glib::ustring& tip,
 
 ScalarParam::~ScalarParam()
 {
+    _value_changed_connection.disconnect();
 }
 
 bool
@@ -146,6 +145,13 @@ ScalarParam::param_make_integer(bool yes)
     inc_page = 10;
 }
 
+void
+ScalarParam::on_value_changed()
+{
+    DocumentUndo::done(param_effect->getSPDoc(), SP_VERB_DIALOG_LIVE_PATH_EFFECT,
+        _("Change scalar parameter"));
+}
+
 Gtk::Widget *
 ScalarParam::param_newWidget()
 {
@@ -162,7 +168,7 @@ ScalarParam::param_newWidget()
     }
 
     rsu->set_undo_parameters(SP_VERB_DIALOG_LIVE_PATH_EFFECT, _("Change scalar parameter"));
-
+    _value_changed_connection = rsu->signal_value_changed().connect (sigc::mem_fun (*this, &ScalarParam::on_value_changed));
     return dynamic_cast<Gtk::Widget *> (rsu);
 }
 
diff --git a/src/live_effects/parameter/parameter.h b/src/live_effects/parameter/parameter.h
index cc2c4f3d6..c24033c42 100644
--- a/src/live_effects/parameter/parameter.h
+++ b/src/live_effects/parameter/parameter.h
@@ -12,6 +12,7 @@
 #include <glibmm/ustring.h>
 #include <2geom/forward.h>
 #include <2geom/pathvector.h>
+#include <sigc++/sigc++.h>
 
 // In gtk2, this wasn't an issue; we could toss around
 // G_MAXDOUBLE and not worry about size allocations. But
@@ -111,6 +112,7 @@ public:
     virtual void param_set_default();
     void param_set_value(gdouble val);
     void param_make_integer(bool yes = true);
+    void on_value_changed();
     void param_set_range(gdouble min, gdouble max);
     void param_set_digits(unsigned digits);
     void param_set_increments(double step, double page);
@@ -122,6 +124,7 @@ public:
     inline operator gdouble() const { return value; };
 
 protected:
+    sigc::connection  _value_changed_connection;
     gdouble value;
     gdouble min;
     gdouble max;