diff --git a/tests/test.cmp b/tests/test.cmp
index 1293838d..806647bb 100644
--- a/tests/test.cmp
+++ b/tests/test.cmp
@@ -1334,7 +1334,7 @@ trigduration() => -1
 # Test adding TIME+TIME and DATETIME+TIME
 set a126 11:00 + 3:00
 11:00 + 03:00 => 14:00
-set a127 23:00 + 5:30
+set a127 '23:00' + 5:30
 23:00 + 05:30 => 04:30
 set a128 '2018-02-03@10:00' + 6:45
 2018-02-03@10:00 + 06:45 => 2018-02-03@16:45
diff --git a/tests/test.rem b/tests/test.rem
index 8266360a..499e74be 100644
--- a/tests/test.rem
+++ b/tests/test.rem
@@ -450,7 +450,7 @@ set a125 trigduration()
 
 # Test adding TIME+TIME and DATETIME+TIME
 set a126 11:00 + 3:00
-set a127 23:00 + 5:30
+set a127 '23:00' + 5:30
 set a128 '2018-02-03@10:00' + 6:45
 set a129 23:30 + '2019-02-02@16:44'