diff --git a/packages/backend-rs/src/config/server.rs b/packages/backend-rs/src/config/server.rs
index e8a7cf73ab..41ada46a4e 100644
--- a/packages/backend-rs/src/config/server.rs
+++ b/packages/backend-rs/src/config/server.rs
@@ -293,7 +293,7 @@ pub fn load_config() -> Config {
     } else {
         server_config.redis.prefix.clone()
     }
-    .unwrap_or(hostname.clone());
+    .unwrap_or_else(|| hostname.clone());
 
     Config {
         url: server_config.url,
diff --git a/packages/backend-rs/src/federation/nodeinfo/generate.rs b/packages/backend-rs/src/federation/nodeinfo/generate.rs
index 49c3f8f63f..cc2add0fc4 100644
--- a/packages/backend-rs/src/federation/nodeinfo/generate.rs
+++ b/packages/backend-rs/src/federation/nodeinfo/generate.rs
@@ -66,7 +66,7 @@ async fn generate_nodeinfo_2_1() -> Result<Nodeinfo21, Error> {
     let metadata = HashMap::from([
         (
             "nodeName".to_string(),
-            json!(meta.name.unwrap_or(CONFIG.host.clone())),
+            json!(meta.name.unwrap_or_else(|| CONFIG.host.clone())),
         ),
         ("nodeDescription".to_string(), json!(meta.description)),
         ("repositoryUrl".to_string(), json!(meta.repository_url)),
@@ -93,7 +93,7 @@ async fn generate_nodeinfo_2_1() -> Result<Nodeinfo21, Error> {
         ("proxyAccountName".to_string(), json!(meta.proxy_account_id)),
         (
             "themeColor".to_string(),
-            json!(meta.theme_color.unwrap_or("#31748f".to_string())),
+            json!(meta.theme_color.unwrap_or_else(|| "#31748f".to_string())),
         ),
     ]);
 
diff --git a/packages/backend-rs/src/init/system_info.rs b/packages/backend-rs/src/init/system_info.rs
index 138e7486e0..c4847cdd0d 100644
--- a/packages/backend-rs/src/init/system_info.rs
+++ b/packages/backend-rs/src/init/system_info.rs
@@ -26,19 +26,19 @@ pub fn show_server_info() -> Result<(), SysinfoPoisonError> {
 
     tracing::info!(
         "Hostname: {}",
-        System::host_name().unwrap_or("unknown".to_string())
+        System::host_name().unwrap_or_else(|| "unknown".to_string())
     );
     tracing::info!(
         "OS: {}",
-        System::long_os_version().unwrap_or("unknown".to_string())
+        System::long_os_version().unwrap_or_else(|| "unknown".to_string())
     );
     tracing::info!(
         "Kernel: {}",
-        System::kernel_version().unwrap_or("unknown".to_string())
+        System::kernel_version().unwrap_or_else(|| "unknown".to_string())
     );
     tracing::info!(
         "CPU architecture: {}",
-        System::cpu_arch().unwrap_or("unknown".to_string())
+        System::cpu_arch().unwrap_or_else(|| "unknown".to_string())
     );
     tracing::info!("CPU threads: {}", system_info.cpus().len());
     tracing::info!("Total memory: {} MiB", system_info.total_memory() / 1048576);
diff --git a/packages/backend-rs/src/service/antenna/check_hit.rs b/packages/backend-rs/src/service/antenna/check_hit.rs
index 8a0bec6e0a..cf4429212c 100644
--- a/packages/backend-rs/src/service/antenna/check_hit.rs
+++ b/packages/backend-rs/src/service/antenna/check_hit.rs
@@ -61,7 +61,7 @@ pub async fn check_hit_antenna(
                 == note_author
                     .host
                     .clone()
-                    .unwrap_or(CONFIG.host.clone())
+                    .unwrap_or_else(|| CONFIG.host.clone())
                     .to_ascii_lowercase()
         });
 
diff --git a/packages/backend-rs/src/service/stream.rs b/packages/backend-rs/src/service/stream.rs
index dc73499968..b87ded9261 100644
--- a/packages/backend-rs/src/service/stream.rs
+++ b/packages/backend-rs/src/service/stream.rs
@@ -66,7 +66,7 @@ pub async fn publish_to_stream(
         format!(
             "{{\"type\":\"{}\",\"body\":{}}}",
             kind,
-            value.unwrap_or("null".to_string()),
+            value.unwrap_or_else(|| "null".to_string()),
         )
     } else {
         value.ok_or(Error::Value("Invalid streaming message".to_string()))?