diff --git a/Cargo.toml b/Cargo.toml
index 0ae7a32..4a47f10 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,10 +5,9 @@ edition = "2021"
 
 [dependencies]
 digest = "0.10"
-libc = "0.2.146"
+libc = "0.2"
 rustls-pemfile = "1.0"
 sha2 = "0.10"
-time = "0.3"
 tinyrand = "0.5"
 x509-parser = "0.15"
 
diff --git a/src/mailstore/filesystem.rs b/src/mailstore/filesystem.rs
index 69198da..31d0901 100644
--- a/src/mailstore/filesystem.rs
+++ b/src/mailstore/filesystem.rs
@@ -535,6 +535,17 @@ fn chown(path: CString, uid: u32, gid: u32) -> Result<(), io::Error> {
     Ok(())
 }
 
+#[cfg(target_os = "freebsd")]
+fn chmod(path: CString, mode: u16) -> Result<(), io::Error> {
+    unsafe {
+        if libc::chmod(path.as_ptr(), mode) != 0 {
+            return Err(io::Error::last_os_error());
+        }
+    }
+    Ok(())
+}
+
+#[cfg(target_os = "linux")]
 fn chmod(path: CString, mode: u32) -> Result<(), io::Error> {
     unsafe {
         if libc::chmod(path.as_ptr(), mode) != 0 {