diff --git a/src/detections/pivot.rs b/src/detections/pivot.rs
index 845ded27..2f83c162 100644
--- a/src/detections/pivot.rs
+++ b/src/detections/pivot.rs
@@ -57,8 +57,8 @@ pub fn insert_pivot_keyword(event_record: &Value) {
     } else {
         return;
     }
-    let mut pivots = PIVOT_KEYWORD.write().unwrap().clone();
-    for (_, pivot) in pivots.iter_mut() {
+    let mut pivots = PIVOT_KEYWORD.write().unwrap();
+    pivots.iter_mut().into_iter().for_each(|(_, pivot)| {
         for field in &pivot.fields {
             if let Some(array_str) = configs::EVENTKEY_ALIAS.get_event_key(&String::from(field)) {
                 let split: Vec<&str> = array_str.split('.').collect();
@@ -82,7 +82,7 @@ pub fn insert_pivot_keyword(event_record: &Value) {
                 }
             }
         }
-    }
+    });
 }
 
 #[cfg(test)]
diff --git a/src/main.rs b/src/main.rs
index aae3f64b..78b05eb1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -297,7 +297,8 @@ impl App {
         if *PIVOT_KEYWORD_LIST_FLAG {
             //ファイル出力の場合
             if let Some(pivot_file) = configs::CONFIG.read().unwrap().args.value_of("output") {
-                for (key, pivot_keyword) in PIVOT_KEYWORD.read().unwrap().iter() {
+                let pivot_key_unions = PIVOT_KEYWORD.read().unwrap().clone();
+                for (key, pivot_keyword) in pivot_key_unions.iter() {
                     let mut f = BufWriter::new(
                         fs::File::create(pivot_file.to_owned() + "-" + key + ".txt").unwrap(),
                     );
@@ -321,7 +322,6 @@ impl App {
                 //output to stdout
                 let mut output =
                     "Pivot keyword results saved to the following files:\n".to_string();
-                let pivot_key_unions = PIVOT_KEYWORD.read().unwrap().clone();
 
                 for (key, _) in pivot_key_unions.iter() {
                     output += &(pivot_file.to_owned() + "-" + key + ".txt" + "\n");