diff --git a/gsk/gskpathbuilder.c b/gsk/gskpathbuilder.c
index 99b05e058f..026db192a2 100644
--- a/gsk/gskpathbuilder.c
+++ b/gsk/gskpathbuilder.c
@@ -342,6 +342,73 @@ gsk_path_builder_add_rect (GskPathBuilder        *builder,
   gsk_contour_get_start_end (contour, NULL, &builder->current_point);
 }
 
+/**
+ * gsk_path_builder_add_rounded_rect:
+ * @builder: a `GskPathBuilder`
+ * @rect: the rounded rect
+ *
+ * Adds @rect as a new contour to the path built in @builder.
+ **/
+void
+gsk_path_builder_add_rounded_rect (GskPathBuilder       *builder,
+                                   const GskRoundedRect *rect)
+{
+  const float weight = M_SQRT1_2;
+
+  g_return_if_fail (builder != NULL);
+  g_return_if_fail (rect != NULL);
+
+  gsk_path_builder_move_to (builder,
+                            rect->bounds.origin.x + rect->corner[GSK_CORNER_TOP_LEFT].width,
+                            rect->bounds.origin.y);
+  /* top */
+  gsk_path_builder_line_to (builder,
+                            rect->bounds.origin.x + rect->bounds.size.width - rect->corner[GSK_CORNER_TOP_RIGHT].width,
+                            rect->bounds.origin.y);
+  /* topright corner */
+  gsk_path_builder_conic_to (builder,
+                             rect->bounds.origin.x + rect->bounds.size.width,
+                             rect->bounds.origin.y,
+                             rect->bounds.origin.x + rect->bounds.size.width,
+                             rect->bounds.origin.y + rect->corner[GSK_CORNER_TOP_RIGHT].height,
+                             weight);
+  /* right */
+  gsk_path_builder_line_to (builder,
+                            rect->bounds.origin.x + rect->bounds.size.width,
+                            rect->bounds.origin.y + rect->bounds.size.height - rect->corner[GSK_CORNER_BOTTOM_RIGHT].height);
+  /* bottomright corner */
+  gsk_path_builder_conic_to (builder,
+                             rect->bounds.origin.x + rect->bounds.size.width,
+                             rect->bounds.origin.y + rect->bounds.size.height,
+                             rect->bounds.origin.x + rect->bounds.size.width - rect->corner[GSK_CORNER_BOTTOM_RIGHT].width,
+                             rect->bounds.origin.y + rect->bounds.size.height,
+                             weight);
+  /* bottom */
+  gsk_path_builder_line_to (builder,
+                            rect->bounds.origin.x + rect->corner[GSK_CORNER_BOTTOM_LEFT].width,
+                            rect->bounds.origin.y + rect->bounds.size.height);
+  /* bottomleft corner */
+  gsk_path_builder_conic_to (builder,
+                             rect->bounds.origin.x,
+                             rect->bounds.origin.y + rect->bounds.size.height,
+                             rect->bounds.origin.x,
+                             rect->bounds.origin.y + rect->bounds.size.height - rect->corner[GSK_CORNER_BOTTOM_LEFT].height,
+                             weight);
+  /* left */
+  gsk_path_builder_line_to (builder,
+                            rect->bounds.origin.x,
+                            rect->bounds.origin.y + rect->corner[GSK_CORNER_TOP_LEFT].height);
+  /* topleft corner */
+  gsk_path_builder_conic_to (builder,
+                             rect->bounds.origin.x,
+                             rect->bounds.origin.y,
+                             rect->bounds.origin.x + rect->corner[GSK_CORNER_TOP_LEFT].width,
+                             rect->bounds.origin.y,
+                             weight);
+  /* done */
+  gsk_path_builder_close (builder);
+}
+
 /**
  * gsk_path_builder_add_circle:
  * @builder: a `GskPathBuilder`
diff --git a/gsk/gskpathbuilder.h b/gsk/gskpathbuilder.h
index f1a59b2504..15bf3c469c 100644
--- a/gsk/gskpathbuilder.h
+++ b/gsk/gskpathbuilder.h
@@ -25,6 +25,7 @@
 #endif
 
 
+#include <gsk/gskroundedrect.h>
 #include <gsk/gsktypes.h>
 
 G_BEGIN_DECLS
@@ -55,6 +56,9 @@ GDK_AVAILABLE_IN_ALL
 void                    gsk_path_builder_add_rect               (GskPathBuilder         *builder,
                                                                  const graphene_rect_t  *rect);
 GDK_AVAILABLE_IN_ALL
+void                    gsk_path_builder_add_rounded_rect       (GskPathBuilder         *builder,
+                                                                 const GskRoundedRect   *rect);
+GDK_AVAILABLE_IN_ALL
 void                    gsk_path_builder_add_circle             (GskPathBuilder         *builder,
                                                                  const graphene_point_t *center,
                                                                  float                   radius);