diff --git a/feed/asterisk-chan-quectel/Makefile b/feed/asterisk-chan-quectel/Makefile
index 89b4f5b..d932aa6 100644
--- a/feed/asterisk-chan-quectel/Makefile
+++ b/feed/asterisk-chan-quectel/Makefile
@@ -77,7 +77,7 @@ if [ -n "$${IPKG_INSTROOT}" ]; then
     exit 0
 fi
 # Add asterisk user to audio and dialout groups
-sed -i -E 's/((audio|dialout):x:[0-9+]:)/\1asterisk/' /etc/group
+sed -i -E 's/((audio|dialout):x:[0-9]+:)/\1asterisk/' /etc/group
 endef