diff --git a/libconfig/src/lib.rs b/libconfig/src/lib.rs
index 1d5bbbb..e1ca5f5 100644
--- a/libconfig/src/lib.rs
+++ b/libconfig/src/lib.rs
@@ -189,10 +189,10 @@ impl Config {
             if is_str {
                 let mut f = root_dir.create_file("/CONFIG.TXT")?;
                 f.seek(SeekFrom::End(0))?;
-                f.write(key.as_bytes());
-                f.write("=".as_bytes());
-                f.write(value.as_slice());
-                f.write(NEWLINE);
+                f.write(key.as_bytes())?;
+                f.write("=".as_bytes())?;
+                f.write(value.as_slice())?;
+                f.write(NEWLINE)?;
             } else {
                 let dir = root_dir.create_dir("/CONFIG")?;
                 let mut f = dir.create_file(&[key, ".BIN"].concat())?;