diff --git a/gtk/gtkrenderborder.c b/gtk/gtkrenderborder.c
index 3426ebfca3..f0edb8cb0c 100644
--- a/gtk/gtkrenderborder.c
+++ b/gtk/gtkrenderborder.c
@@ -725,12 +725,6 @@ gtk_css_style_snapshot_border (GtkCssStyle *style,
     }
 }
 
-gboolean
-gtk_css_style_render_has_outline (GtkCssStyle *style)
-{
-  return _gtk_css_number_value_get (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_OUTLINE_WIDTH), 100) > 0;
-}
-
 static void
 compute_outline_rect (GtkCssStyle       *style,
                       gdouble            x,
diff --git a/gtk/gtkrenderborderprivate.h b/gtk/gtkrenderborderprivate.h
index b8b95a2174..60cb7a016e 100644
--- a/gtk/gtkrenderborderprivate.h
+++ b/gtk/gtkrenderborderprivate.h
@@ -34,7 +34,6 @@ void            gtk_css_style_snapshot_border           (GtkCssStyle
                                                          gdouble                 width,
                                                          gdouble                 height);
 
-gboolean        gtk_css_style_render_has_outline        (GtkCssStyle            *style);
 void            gtk_css_style_snapshot_outline          (GtkCssStyle            *style,
                                                          GtkSnapshot            *snapshot,
                                                          gdouble                 width,