diff --git a/src/mkmaze.c b/src/mkmaze.c
index c423e0ff6..9045b9458 100644
--- a/src/mkmaze.c
+++ b/src/mkmaze.c
@@ -1445,9 +1445,9 @@ static void mv_bubble(struct bubble *, coordxy, coordxy, boolean);
 void
 movebubbles(void)
 {
-    static const struct rm water_pos = { cmap_to_glyph(S_water), WATER, 0, 0,
+    static const struct rm water_pos = { cmap_a_to_glyph(S_water), WATER, 0, 0,
                                          0, 0, 0, 0, 0, 0 };
-    static const struct rm air_pos = { cmap_to_glyph(S_cloud), AIR, 0, 0, 0,
+    static const struct rm air_pos = { cmap_a_to_glyph(S_cloud), AIR, 0, 0, 0,
                                        1, 0, 0, 0, 0 };
     static boolean up = FALSE;
     struct bubble *b;