diff --git a/app/gegl/gimp-gegl-mask.c b/app/gegl/gimp-gegl-mask.c
index 8c896b8eb5..0873f9c147 100644
--- a/app/gegl/gimp-gegl-mask.c
+++ b/app/gegl/gimp-gegl-mask.c
@@ -123,6 +123,8 @@ gimp_gegl_mask_bounds (GeglBuffer *buffer,
                                                                              \
                                 if (y < ty1) ty1 = y;                        \
                                 if (y > ty2) ty2 = y;                        \
+                                                                             \
+                                break;                                       \
                               }                                              \
                           }                                                  \
                                                                              \