diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3ad5522b..6ba2ef59 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -38,6 +38,7 @@
   scrollback.
 * Mouse cursor from `hand2` to `left_ptr` when client is capturing the
   mouse.
+* Sixel images are now removed when the font size is **decreased**.
 
 
 ### Deprecated
diff --git a/sixel.c b/sixel.c
index a4b27416..80ac3843 100644
--- a/sixel.c
+++ b/sixel.c
@@ -66,6 +66,17 @@ sixel_destroy(struct sixel *sixel)
     sixel->data = NULL;
 }
 
+void
+sixel_destroy_all(struct terminal *term)
+{
+    tll_foreach(term->normal.sixel_images, it)
+        sixel_destroy(&it->item);
+    tll_foreach(term->alt.sixel_images, it)
+        sixel_destroy(&it->item);
+    tll_free(term->normal.sixel_images);
+    tll_free(term->alt.sixel_images);
+}
+
 static void
 sixel_erase(struct terminal *term, struct sixel *sixel)
 {
diff --git a/sixel.h b/sixel.h
index bb3eb730..fc59d6e9 100644
--- a/sixel.h
+++ b/sixel.h
@@ -11,6 +11,7 @@ void sixel_put(struct terminal *term, uint8_t c);
 void sixel_unhook(struct terminal *term);
 
 void sixel_destroy(struct sixel *sixel);
+void sixel_destroy_all(struct terminal *term);
 
 /*
  * Deletes all sixels that are touched by the specified row(s). Used
diff --git a/terminal.c b/terminal.c
index b7a49375..c3a36b45 100644
--- a/terminal.c
+++ b/terminal.c
@@ -1423,7 +1423,30 @@ term_font_size_adjust(struct terminal *term, double amount)
         return false;
     }
 
-    term_set_fonts(term, (struct fcft_font *[]){data[0].font_out, data[1].font_out, data[2].font_out, data[3].font_out});
+    const int old_cell_width = term->cell_width;
+    const int old_cell_height = term->cell_height;
+
+    if (!term_set_fonts(term, (struct fcft_font *[]){data[0].font_out, data[1].font_out, data[2].font_out, data[3].font_out}))
+        return false;
+
+    if (term->cell_width < old_cell_width ||
+        term->cell_height < old_cell_height)
+    {
+        /*
+         * The cell size has decreased.
+         *
+         * This means sixels, which we cannot resize, no longer fit
+         * into their "allocated" grid space.
+         *
+         * To be able to fit them, we would have to change the grid
+         * content. Inserting empty lines _might_ seem acceptable, but
+         * we'd also need to insert empty columns, which would break
+         * existing layout completely.
+         *
+         * So we delete them.
+         */
+        sixel_destroy_all(term);
+    }
     return true;
 }