diff --git a/app/tools/gimpairbrushtool.c b/app/tools/gimpairbrushtool.c
index 85a67a934c..a0816fd588 100644
--- a/app/tools/gimpairbrushtool.c
+++ b/app/tools/gimpairbrushtool.c
@@ -89,7 +89,7 @@ gimp_airbrush_options_gui (GimpToolOptions *tool_options)
   gtk_widget_show (button);
 
   scale = gimp_prop_spin_scale_new (config, "rate",
-                                    _("Rate"),
+                                    C_("airbrush-tool", "Rate"),
                                     1.0, 10.0, 1);
   gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
   gtk_widget_show (scale);
diff --git a/app/tools/gimpconvolvetool.c b/app/tools/gimpconvolvetool.c
index b2f46d2154..48eebd15d7 100644
--- a/app/tools/gimpconvolvetool.c
+++ b/app/tools/gimpconvolvetool.c
@@ -226,7 +226,7 @@ gimp_convolve_options_gui (GimpToolOptions *tool_options)
 
   /*  the rate scale  */
   scale = gimp_prop_spin_scale_new (config, "rate",
-                                    _("Rate"),
+                                    C_("convolve-tool", "Rate"),
                                     1.0, 10.0, 1);
   gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
   gtk_widget_show (scale);
diff --git a/app/tools/gimpsmudgetool.c b/app/tools/gimpsmudgetool.c
index 7b2fcbae21..e150d52413 100644
--- a/app/tools/gimpsmudgetool.c
+++ b/app/tools/gimpsmudgetool.c
@@ -89,7 +89,7 @@ gimp_smudge_options_gui (GimpToolOptions *tool_options)
 
   /*  the rate scale  */
   scale = gimp_prop_spin_scale_new (config, "rate",
-                                    _("Rate"),
+                                    C_("smudge-tool", "Rate"),
                                     1.0, 10.0, 1);
   gtk_box_pack_start (GTK_BOX (vbox), scale, FALSE, FALSE, 0);
   gtk_widget_show (scale);