diff --git a/st.c b/st.c
index 999bab6..3eee18b 100644
--- a/st.c
+++ b/st.c
@@ -2201,9 +2201,24 @@ csihandle(void)
 				tclearregion(0, 0, term.col-1, term.c.y-1);
 			tclearregion(0, term.c.y, term.c.x, term.c.y);
 			break;
-		case 2: /* all */
+		case 2: /* screen */
 			tclearregion(0, 0, term.col-1, term.row-1);
 			break;
+		case 3: /* all including scrollback */
+			tclearregion(0, 0, term.col-1, term.row-1);
+
+			#if SCROLLBACK_PATCH
+			term.scr = 0;
+			term.histi = 0;
+			for (int i = 0; i < HISTSIZE; i++)
+				term.hist[i][0].u = '\0';
+			#endif // SCROLLBACK_PATCH
+
+			#if SIXEL_PATCH
+			for (im = term.images; im; im = im->next)
+				im->should_delete = 1;
+			#endif // SIXEL_PATCH
+			break;
 		default:
 			goto unknown;
 		}
diff --git a/st.info b/st.info
index a45d8de..c21730e 100644
--- a/st.info
+++ b/st.info
@@ -10,7 +10,7 @@ st-mono| simpleterm monocolor,
 	cbt=\E[Z,
 	cvvis=\E[?25h,
 	civis=\E[?25l,
-	clear=\E[H\E[2J,
+	clear=\E[H\E[3J,
 	cnorm=\E[?12l\E[?25h,
 	colors#2,
 	cols#80,