diff --git a/CMakeLists.txt b/CMakeLists.txt
index 865149d..210e320 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,6 +16,13 @@ set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-gc-sections")
 
 add_compile_options(-std=gnu17)
 
+if(UA2F_CUSTOM_USER_AGENT)
+    if(NOT UA2F_USER_AGENT_STRING)
+        message(FATAL_ERROR "UA2F_USER_AGENT_STRING is not set")
+    endif()
+    add_compile_definitions(UA2F_CUSTOM_UA="${UA2F_USER_AGENT_STRING}")
+endif()
+
 add_executable(ua2f
         src/ua2f.c
         src/statistics.c
diff --git a/openwrt/Makefile b/openwrt/Makefile
index 2147f47..b741032 100644
--- a/openwrt/Makefile
+++ b/openwrt/Makefile
@@ -19,6 +19,7 @@ define Package/ua2f
   SUBMENU:=Routing and Redirection
   TITLE:=Change User-Agent to Fwords on the fly.
   URL:=https://github.com/Zxilly/UA2F
+  MENU:=1
   DEPENDS:= \
     +libnetfilter-conntrack \
     +libnetfilter-queue \
@@ -30,6 +31,33 @@ define Package/ua2f
     +PACKAGE_firewall:iptables-mod-nfqueue
 endef
 
+define Package/ua2f/config
+  menu "Configuration"
+    depends on PACKAGE_ua2f
+
+  config UA2F_CUSTOM_USER_AGENT
+    bool "Enable custom User-Agent"
+    default n
+    help
+      Enable this option to use a custom User-Agent string.
+
+  config UA2F_USER_AGENT_STRING
+    string "Custom User-Agent string"
+    depends on UA2F_CUSTOM_USER_AGENT
+    default "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.0.0 Safari/537.36 Edg/112.0.1722.68"
+    help
+      Specify the custom User-Agent string to use when UA2F_CUSTOM_USER_AGENT is enabled.
+
+  endmenu
+endef
+
+define Build/Configure
+	$(call Build/Configure/Default, \
+		-DUA2F_CUSTOM_USER_AGENT=$(if $(CONFIG_UA2F_CUSTOM_USER_AGENT),ON,OFF), \
+		-DUA2F_USER_AGENT_STRING="$(CONFIG_UA2F_USER_AGENT_STRING)" \
+	)
+endef
+
 define Package/ua2f/description
   Change User-agent to Fwords to prevent being checked by Dr.Com.
 endef