diff --git a/debug-level-conf/50-tty.rules b/debug-level-conf/50-tty.rules
index 05e3341..9c16d1e 100644
--- a/debug-level-conf/50-tty.rules
+++ b/debug-level-conf/50-tty.rules
@@ -2,4 +2,4 @@ SUBSYSTEM=="pps[0-9]*", GROUP="dialout", MODE="0660"
 SUBSYSTEM=="tty[0-9]*", GROUP="dialout", MODE="0660"
 SUBSYSTEM=="tty[A-Z]*[0-9]*", GROUP="dialout", MODE="0660"
 SUBSYSTEM=="i2c[A-Z]-*[0-9]*", GROUP="dialout", MODE="0660"
-SUBSYSTEM=="rtc[0-9]?*", GROUP="dialout", MODE="0660"
\ No newline at end of file
+SUBSYSTEM=="rtc[0-9]*", GROUP="dialout", MODE="0660"
\ No newline at end of file