diff --git a/src/kind.rs b/src/kind.rs
index 9e40ce2..b5c044a 100644
--- a/src/kind.rs
+++ b/src/kind.rs
@@ -2,16 +2,17 @@ use anyhow::{anyhow, Result};
 
 #[derive(Debug)]
 pub enum Kind {
-    Blob,    // 100644 or 100755
-    Commit,  // 160000
-    Tree,    // 040000
-    Symlink, // 120000
+    Blob(bool), // 100644 or 100755
+    Commit,     // 160000
+    Tree,       // 040000
+    Symlink,    // 120000
 }
 
 impl Kind {
     pub fn from_mode(mode: &str) -> Result<Self> {
         match mode {
-            "100644" | "100755" => Ok(Kind::Blob),
+            "100644" => Ok(Kind::Blob(false)),
+            "100755" => Ok(Kind::Blob(true)),
             "160000" => Ok(Kind::Commit),
             "120000" => Ok(Kind::Symlink),
             "040000" | "40000" => Ok(Kind::Tree),
@@ -20,9 +21,19 @@ impl Kind {
         }
     }
 
+    pub fn to_mode(&self) -> &str {
+        match self {
+            Kind::Blob(false) => "100644",
+            Kind::Blob(true) => "100755",
+            Kind::Commit => "160000",
+            Kind::Tree => "040000",
+            Kind::Symlink => "120000",
+        }
+    }
+
     pub fn string(&self) -> &str {
         match self {
-            Kind::Blob => "blob",
+            Kind::Blob(_) => "blob",
             Kind::Commit => "commit",
             Kind::Tree => "tree",
             Kind::Symlink => "symlink",
diff --git a/src/object.rs b/src/object.rs
index 24bd05c..eb8eb9f 100644
--- a/src/object.rs
+++ b/src/object.rs
@@ -53,7 +53,7 @@ pub fn read_object(path: &Path, object: &str) -> Result<Object<impl BufRead>> {
     };
 
     let object_type = match object_type {
-        "blob" => Kind::Blob,
+        "blob" => Kind::Blob(true),
         "commit" => Kind::Commit,
         "tree" => Kind::Tree,
         _ => anyhow::bail!("invalid object type found"),
@@ -128,7 +128,7 @@ impl<R: BufRead> Object<R> {
         let mut buf_hash: [u8; 20] = [0; 20];
 
         let res = match self.kind {
-            Kind::Blob | Kind::Commit => {
+            Kind::Blob(_) | Kind::Commit => {
                 self.data.read_to_end(&mut buf)?;
                 String::from_utf8(buf)?
             }
diff --git a/src/tree.rs b/src/tree.rs
index 6d870a7..a9a498e 100644
--- a/src/tree.rs
+++ b/src/tree.rs
@@ -1,5 +1,6 @@
 use anyhow::{Context, Result};
 use sha1::{Digest, Sha1};
+use std::os::unix::fs::MetadataExt;
 use std::path::PathBuf;
 
 use crate::kind::Kind;
@@ -23,11 +24,11 @@ pub fn write_tree(_repo_path: &PathBuf, path: &PathBuf) -> Result<[u8; 20]> {
             kind = Kind::Tree;
         } else {
             hash = hash_file(&file_path)?;
-            kind = Kind::Blob;
+            kind = Kind::Blob(file_path.metadata()?.mode() & 0o111 != 0);
         }
 
         entries.push(TreeObject {
-            mode: "100644".to_string(),
+            mode: kind.to_mode().to_string(),
             kind,
             name: file_name.into_string().unwrap(),
             hash,