diff --git a/src/display.c b/src/display.c
index 1369fbfb3..399bb1842 100644
--- a/src/display.c
+++ b/src/display.c
@@ -900,6 +900,7 @@ tmp_at(x, y)
 	    break;
 
 	default:	/* do it */
+	    if (!isok(x,y)) break;
 	    if (tglyph->style == DISP_BEAM || tglyph->style == DISP_ALL) {
 		if (tglyph->style != DISP_ALL && !cansee(x,y)) break;
 		if (tglyph->sidx >= TMP_AT_MAX_GLYPHS) break; /* too many locations */
diff --git a/src/mthrowu.c b/src/mthrowu.c
index e61814321..1ff6cddc3 100644
--- a/src/mthrowu.c
+++ b/src/mthrowu.c
@@ -440,7 +440,7 @@ struct obj *obj;		/* missile (or stack providing it) */
 		tmp_at(bhitpos.x, bhitpos.y);
 		delay_output();
 	}
-	tmp_at(bhitpos.x, bhitpos.y);
+	if (isok(bhitpos.x, bhitpos.y)) tmp_at(bhitpos.x, bhitpos.y);
 	delay_output();
 	tmp_at(DISP_END, 0);