diff --git a/glfw/wl_window.c b/glfw/wl_window.c
index 6888f5af4..402d379d6 100644
--- a/glfw/wl_window.c
+++ b/glfw/wl_window.c
@@ -1054,6 +1054,7 @@ layer_set_properties(const _GLFWwindow *window, bool during_creation, uint32_t w
                 case GLFW_EDGE_CENTER:
                     break;
                 case GLFW_EDGE_CENTER_SIZED:
+                    which_anchor = 0;
                     panel_width = width; panel_height = height;
                     break;
                 case GLFW_EDGE_NONE: