diff --git a/src/save.c b/src/save.c
index cf13994bd..6cb02e643 100644
--- a/src/save.c
+++ b/src/save.c
@@ -1171,6 +1171,7 @@ int parse_save_OPS(void *save, int size, int replace, int x0, int y0, unsigned c
 				}
 			}
 		}
+		gravity_mask();
 	}
 	
 	//Read particle data