diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4c8245b2..0c44dd13 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -76,7 +76,9 @@
 * `XTMODKEYS` state not being reset on a terminal reset.
 * In Gnome dock foot always groups under "foot client".  Change
   instances of footclient and foot to appear as "foot client" and
-  "foot" respectively. ([#1355][1355])
+  "foot" respectively. ([#1355][1355]).
+* Glitchy rendering when alpha (transparency) is changed between
+  opaque and non-opaque at runtime (using OSC-11).
 
 [1317]: https://codeberg.org/dnkl/foot/issues/1317
 [1355]: https://codeberg.org/dnkl/foot/issues/1355
diff --git a/osc.c b/osc.c
index 55cfcf84..45d114de 100644
--- a/osc.c
+++ b/osc.c
@@ -729,8 +729,15 @@ osc_dispatch(struct terminal *term)
 
         case 11:
             term->colors.bg = color;
-            if (have_alpha)
+            if (have_alpha) {
+                const bool changed = term->colors.alpha != alpha;
                 term->colors.alpha = alpha;
+
+                if (changed) {
+                    wayl_win_alpha_changed(term->window);
+                    term_font_subpixel_changed(term);
+                }
+            }
             break;
 
         case 17:
diff --git a/pgo/pgo.c b/pgo/pgo.c
index b41b5850..d9ee5855 100644
--- a/pgo/pgo.c
+++ b/pgo/pgo.c
@@ -94,6 +94,7 @@ wayl_win_init(struct terminal *term, const char *token)
 }
 
 void wayl_win_destroy(struct wl_window *win) {}
+void wayl_win_alpha_changed(struct wl_window *win) {}
 bool wayl_win_set_urgent(struct wl_window *win) { return true; }
 
 bool
diff --git a/wayland.c b/wayland.c
index 68a7a4f1..51161cf0 100644
--- a/wayland.c
+++ b/wayland.c
@@ -1495,16 +1495,7 @@ wayl_win_init(struct terminal *term, const char *token)
         goto out;
     }
 
-    if (term->colors.alpha == 0xffff) {
-        struct wl_region *region = wl_compositor_create_region(
-            term->wl->compositor);
-
-        if (region != NULL) {
-            wl_region_add(region, 0, 0, INT32_MAX, INT32_MAX);
-            wl_surface_set_opaque_region(win->surface, region);
-            wl_region_destroy(region);
-        }
-    }
+    wayl_win_alpha_changed(win);
 
     wl_surface_add_listener(win->surface, &surface_listener, win);
 
@@ -1798,6 +1789,24 @@ wayl_roundtrip(struct wayland *wayl)
     wayl_flush(wayl);
 }
 
+void
+wayl_win_alpha_changed(struct wl_window *win)
+{
+    struct terminal *term = win->term;
+
+    if (term->colors.alpha == 0xffff) {
+        struct wl_region *region = wl_compositor_create_region(
+            term->wl->compositor);
+
+        if (region != NULL) {
+            wl_region_add(region, 0, 0, INT32_MAX, INT32_MAX);
+            wl_surface_set_opaque_region(win->surface, region);
+            wl_region_destroy(region);
+        }
+    } else
+        wl_surface_set_opaque_region(win->surface, NULL);
+}
+
 #if defined(HAVE_XDG_ACTIVATION)
 static void
 activation_token_for_urgency_done(const char *token, void *data)
diff --git a/wayland.h b/wayland.h
index 4b6939ab..0d627052 100644
--- a/wayland.h
+++ b/wayland.h
@@ -434,6 +434,7 @@ void wayl_roundtrip(struct wayland *wayl);
 struct wl_window *wayl_win_init(struct terminal *term, const char *token);
 void wayl_win_destroy(struct wl_window *win);
 
+void wayl_win_alpha_changed(struct wl_window *win);
 bool wayl_win_set_urgent(struct wl_window *win);
 
 bool wayl_win_csd_titlebar_visible(const struct wl_window *win);