diff --git a/bits/27_csfutils.js b/bits/27_csfutils.js
index 31d94b0..abdb749 100644
--- a/bits/27_csfutils.js
+++ b/bits/27_csfutils.js
@@ -173,7 +173,11 @@ function sheet_add_aoa(_ws/*:?Worksheet*/, data/*:AOA*/, opts/*:?any*/)/*:Worksh
 			}
 		}
 	}
-	if(range.s.c < 10000000) ws['!ref'] = encode_range(range);
+	if (range.s.c < 10000000) {
+		if (range.s.c > _C) range.s.c = _C;
+		if (range.s.r > _R) range.s.r = _R;
+		ws['!ref'] = encode_range(range);
+	}
 	return ws;
 }
 function aoa_to_sheet(data/*:AOA*/, opts/*:?any*/)/*:Worksheet*/ { return sheet_add_aoa(null, data, opts); }