diff --git a/feed/asterisk-chan-quectel/Makefile b/feed/asterisk-chan-quectel/Makefile
index 193ffcf..89b4f5b 100644
--- a/feed/asterisk-chan-quectel/Makefile
+++ b/feed/asterisk-chan-quectel/Makefile
@@ -76,7 +76,8 @@ define Package/$(PKG_NAME)/postinst
 if [ -n "$${IPKG_INSTROOT}" ]; then
     exit 0
 fi
-usermod -a -G audio,dialout asterisk
+# Add asterisk user to audio and dialout groups
+sed -i -E 's/((audio|dialout):x:[0-9+]:)/\1asterisk/' /etc/group
 endef