diff --git a/src/area/model.rs b/src/area/model.rs
index 5601c90..ec5fa26 100644
--- a/src/area/model.rs
+++ b/src/area/model.rs
@@ -147,12 +147,6 @@ impl Area {
             .map_err(Into::into)
     }
 
-    pub fn patch_tag(id: i64, name: &str, value: Value, conn: &Connection) -> Result<Option<Area>> {
-        let mut patch_set = Map::new();
-        patch_set.insert(name.into(), value);
-        Area::patch_tags(id, patch_set, conn)
-    }
-
     pub fn patch_tags(
         id: i64,
         tags: Map<String, Value>,
@@ -323,7 +317,7 @@ const fn mapper() -> fn(&Row) -> rusqlite::Result<Area> {
 mod test {
     use crate::{area::Area, test::mock_conn, Result};
     use geojson::{Feature, GeoJson};
-    use serde_json::{json, Map, Value};
+    use serde_json::{json, Map};
     use time::ext::NumericalDuration;
     use time::{macros::datetime, OffsetDateTime};
 
@@ -394,7 +388,11 @@ mod test {
         Area::insert(Area::mock_tags(), &conn)?.unwrap();
         Area::insert(Area::mock_tags(), &conn)?.unwrap();
         Area::insert(Area::mock_tags(), &conn)?.unwrap();
-        Area::patch_tag(2, "name", "sushi".into(), &conn)?;
+        Area::patch_tags(
+            2,
+            Map::from_iter([("name".into(), "sushi".into())].into_iter()),
+            &conn,
+        )?;
         assert_eq!(1, Area::select_by_search_query("sus", &conn)?.len());
         assert_eq!(1, Area::select_by_search_query("hi", &conn)?.len());
         assert_eq!(0, Area::select_by_search_query("sashimi", &conn)?.len());
@@ -427,23 +425,6 @@ mod test {
         Ok(())
     }
 
-    #[test]
-    fn patch_tag() -> Result<()> {
-        let conn = mock_conn();
-        let area = Area::insert(Area::mock_tags(), &conn)?.ok_or("failed to insert area")?;
-        let new_tag_name = "new_tag";
-        let new_tag_value: Value = "new_tag_value".into();
-        Area::patch_tag(area.id, new_tag_name, new_tag_value.clone(), &conn)?;
-        assert_eq!(
-            Some(&new_tag_value),
-            Area::select_by_id(1, &conn)?
-                .ok_or("")?
-                .tags
-                .get(new_tag_name)
-        );
-        Ok(())
-    }
-
     #[test]
     fn patch_tags() -> Result<()> {
         let conn = mock_conn();
diff --git a/src/area/service.rs b/src/area/service.rs
index 4e0dcf0..37871d3 100644
--- a/src/area/service.rs
+++ b/src/area/service.rs
@@ -32,18 +32,11 @@ pub fn insert(tags: Map<String, Value>, conn: &mut Connection) -> Result<Area> {
     Ok(area)
 }
 
-pub fn patch_tag(
-    id_or_alias: &str,
-    tag_name: &str,
-    tag_value: &Value,
-    conn: &mut Connection,
+pub fn patch_tags(
+    area_id_or_alias: &str,
+    tags: Map<String, Value>,
+    conn: &Connection,
 ) -> Result<Area> {
-    let mut tags = Map::new();
-    tags.insert(tag_name.to_string(), tag_value.clone());
-    patch_tags(id_or_alias, tags, conn)
-}
-
-fn patch_tags(area_id_or_alias: &str, tags: Map<String, Value>, conn: &Connection) -> Result<Area> {
     if tags.contains_key("url_alias") {
         return Err(Error::InvalidInput("url_alias can't be changed".into()));
     }
diff --git a/src/rpc/set_area_icon.rs b/src/rpc/set_area_icon.rs
index 191dc40..3d67e87 100644
--- a/src/rpc/set_area_icon.rs
+++ b/src/rpc/set_area_icon.rs
@@ -4,7 +4,7 @@ use base64::prelude::*;
 use deadpool_sqlite::Pool;
 use jsonrpc_v2::{Data, Params};
 use serde::Deserialize;
-use serde_json::Value;
+use serde_json::Map;
 use std::{fs::OpenOptions, io::Write, sync::Arc};
 
 const NAME: &str = "set_area_icon";
@@ -37,19 +37,12 @@ pub async fn run(Params(args): Params<Args>, pool: Data<Arc<Pool>>) -> Result<Rp
         ))?;
     file.write_all(&bytes)?;
     file.flush()?;
+    let url = format!("https://static.btcmap.org/images/areas/{file_name}");
+    let patch_set = Map::from_iter([("icon_square".into(), url.into())].into_iter());
     let area = pool
         .get()
         .await?
-        .interact(move |conn| {
-            Area::patch_tag(
-                area.id,
-                "icon:square",
-                Value::String(format!(
-                    "https://static.btcmap.org/images/areas/{file_name}"
-                )),
-                conn,
-            )
-        })
+        .interact(move |conn| Area::patch_tags(area.id, patch_set, conn))
         .await??
         .ok_or("Failed to update area tag")?;
     Ok(area.into())
diff --git a/src/rpc/set_area_tag.rs b/src/rpc/set_area_tag.rs
index 16d4c5e..4b0849d 100644
--- a/src/rpc/set_area_tag.rs
+++ b/src/rpc/set_area_tag.rs
@@ -7,7 +7,7 @@ use crate::{
 use deadpool_sqlite::Pool;
 use jsonrpc_v2::{Data, Params};
 use serde::Deserialize;
-use serde_json::Value;
+use serde_json::{Map, Value};
 use std::sync::Arc;
 use tracing::info;
 
@@ -23,12 +23,11 @@ pub struct Args {
 
 pub async fn run(Params(args): Params<Args>, pool: Data<Arc<Pool>>) -> Result<RpcArea> {
     let admin = admin::service::check_rpc(&args.password, NAME, &pool).await?;
-    let cloned_name = args.name.clone();
-    let cloned_value = args.value.clone();
+    let patch_set = Map::from_iter([(args.name.clone(), args.value.clone())].into_iter());
     let area = pool
         .get()
         .await?
-        .interact(move |conn| area::service::patch_tag(&args.id, &cloned_name, &cloned_value, conn))
+        .interact(move |conn| area::service::patch_tags(&args.id, patch_set, conn))
         .await??;
     let log_message = format!(
         "{} set tag {} = {} for area {} https://api.btcmap.org/v3/areas/{}",