diff --git a/CHANGELOG.md b/CHANGELOG.md
index f7bd40d8..20c52d1f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -39,6 +39,8 @@
 
 * Non-empty lines are now considered to have a hard linebreak,
   _unless_ an actual word-wrap is inserted.
+* Setting `DECSDM` now _disables_ sixel scrolling, while resetting it
+  _enables_ scrolling (https://codeberg.org/dnkl/foot/issues/631).
 
 
 ### Deprecated
diff --git a/csi.c b/csi.c
index fcc2800f..80ee75cd 100644
--- a/csi.c
+++ b/csi.c
@@ -402,7 +402,7 @@ decset_decrst(struct terminal *term, unsigned param, bool enable)
         break;
 
     case 80:
-        term->sixel.scrolling = enable;
+        term->sixel.scrolling = !enable;
         break;
 
     case 1000:
@@ -611,7 +611,7 @@ decrqm(const struct terminal *term, unsigned param, bool *enabled)
     case 12: *enabled = term->cursor_blink.decset; return true;
     case 25: *enabled = !term->hide_cursor; return true;
     case 45: *enabled = term->reverse_wrap; return true;
-    case 80: *enabled = term->sixel.scrolling; return true;
+    case 80: *enabled = !term->sixel.scrolling; return true;
     case 1000: *enabled = term->mouse_tracking == MOUSE_CLICK; return true;
     case 1001: *enabled = false; return true;
     case 1002: *enabled = term->mouse_tracking == MOUSE_DRAG; return true;
@@ -654,7 +654,7 @@ xtsave(struct terminal *term, unsigned param)
     case 25: term->xtsave.show_cursor = !term->hide_cursor; break;
     case 45: term->xtsave.reverse_wrap = term->reverse_wrap; break;
     case 47: term->xtsave.alt_screen = term->grid == &term->alt; break;
-    case 80: term->xtsave.sixel_scrolling = term->sixel.scrolling; break;
+    case 80: term->xtsave.sixel_display_mode = !term->sixel.scrolling; break;
     case 1000: term->xtsave.mouse_click = term->mouse_tracking == MOUSE_CLICK; break;
     case 1001: break;
     case 1002: term->xtsave.mouse_drag = term->mouse_tracking == MOUSE_DRAG; break;
@@ -696,7 +696,7 @@ xtrestore(struct terminal *term, unsigned param)
     case 25: enable = term->xtsave.show_cursor; break;
     case 45: enable = term->xtsave.reverse_wrap; break;
     case 47: enable = term->xtsave.alt_screen; break;
-    case 80: enable = term->xtsave.sixel_scrolling; break;
+    case 80: enable = term->xtsave.sixel_display_mode; break;
     case 1000: enable = term->xtsave.mouse_click; break;
     case 1001: return;
     case 1002: enable = term->xtsave.mouse_drag; break;
diff --git a/terminal.h b/terminal.h
index 309f7db6..12a637a0 100644
--- a/terminal.h
+++ b/terminal.h
@@ -378,7 +378,7 @@ struct terminal {
         bool ime:1;
         bool app_sync_updates:1;
 
-        bool sixel_scrolling:1;
+        bool sixel_display_mode:1;
         bool sixel_private_palette:1;
         bool sixel_cursor_right_of_graphics:1;
     } xtsave;