diff --git a/xwords4/android/XWords4/res/values/strings.xml b/xwords4/android/XWords4/res/values/strings.xml
index 90c95d620..e86ec8b91 100644
--- a/xwords4/android/XWords4/res/values/strings.xml
+++ b/xwords4/android/XWords4/res/values/strings.xml
@@ -133,7 +133,7 @@
 	<string name="str_no_peek_robot_tiles">No peeking at the robot\'s tiles!</string>
 	<string name="str_cant_trade_mid_move">Remove played tiles before exchanging.</string>
 	<string name="str_too_few_tiles_left_to_trade">Too few tiles left to exchange.</string>
-	<string name="str_cant_undo_tileassign">Tile assignment can't be undone.</string>
+	<string name="str_cant_undo_tileassign">Tile assignment can\'t be undone.</string>
 	<string name="str_cant_hint_while_disabled">The hint feature is disabled for this game.  Enable it for a new game using the Settings dialog.</string>
 	<string name="str_no_peek_remote_tiles">No peeking at remote players\' tiles!</string>
 	<string name="str_reg_unexpected_user">Refused attempt to register unexpected user[s]</string>