diff --git a/libraries/RC_Channel/RC_Channel.h b/libraries/RC_Channel/RC_Channel.h
index 277e44ae76..c96a56e59e 100644
--- a/libraries/RC_Channel/RC_Channel.h
+++ b/libraries/RC_Channel/RC_Channel.h
@@ -20,9 +20,9 @@ class RC_Channel{
 	///
 	RC_Channel(AP_Var::Key key, const prog_char *name) :
 	    _group(key, name),
-        radio_min (&_group, 0, 1500, name ? "MIN" : 0), // suppress name if group has no name
-        radio_trim(&_group, 1, 1500, name ? "TRIM" : 0),
-        radio_max (&_group, 2, 1500, name ? "MAX" : 0),
+        radio_min (&_group, 0, 1500, name ? PSTR("MIN") : 0), // suppress name if group has no name
+        radio_trim(&_group, 1, 1500, name ? PSTR("TRIM") : 0),
+        radio_max (&_group, 2, 1500, name ? PSTR("MAX") : 0),
 		_high(1),
 		_filter(true),
 		_reverse(1),