diff --git a/rust/ews_xpcom/src/outgoing.rs b/rust/ews_xpcom/src/outgoing.rs
index 71fb0d2027..3a9be6e56a 100644
--- a/rust/ews_xpcom/src/outgoing.rs
+++ b/rust/ews_xpcom/src/outgoing.rs
@@ -189,8 +189,9 @@ impl EwsOutgoingServer {
         let host = ews_url.host_str().ok_or(nserror::NS_ERROR_FAILURE)?;
         let url = nsCString::from(format!("ews://{username}@{host}"));
 
-        let io_service = xpcom::get_service::<nsIIOService>(c"@mozilla.org/network/io-service;1")
-            .ok_or(nserror::NS_ERROR_FAILURE)?;
+        let io_service =
+            xpcom::get_service::<nsIIOService>(cstr::cstr!("@mozilla.org/network/io-service;1"))
+                .ok_or(nserror::NS_ERROR_FAILURE)?;
 
         getter_addrefs(|p| unsafe { io_service.NewURI(&*url, ptr::null(), ptr::null(), p) })
     }
@@ -312,9 +313,10 @@ impl EwsOutgoingServer {
 
 /// Open the file provided and read its content into a vector of bytes.
 fn read_file(file: &nsIFile) -> Result<Vec<u8>, nsresult> {
-    let file_stream =
-        create_instance::<nsIFileInputStream>(c"@mozilla.org/network/file-input-stream;1")
-            .ok_or(nserror::NS_ERROR_FAILURE)?;
+    let file_stream = create_instance::<nsIFileInputStream>(cstr::cstr!(
+        "@mozilla.org/network/file-input-stream;1"
+    ))
+    .ok_or(nserror::NS_ERROR_FAILURE)?;
 
     // Open a stream from the file, and figure out how many bytes can be read
     // from it.
diff --git a/rust/moz_http/src/client.rs b/rust/moz_http/src/client.rs
index 7012e32d1b..102628de16 100644
--- a/rust/moz_http/src/client.rs
+++ b/rust/moz_http/src/client.rs
@@ -52,7 +52,11 @@ impl Client {
     }
 
     /// Starts building an HTTP request to the given method and URL.
-    pub fn request<'rb>(&self, method: Method, url: &'rb Url) -> crate::Result<RequestBuilder<'rb>> {
+    pub fn request<'rb>(
+        &self,
+        method: Method,
+        url: &'rb Url,
+    ) -> crate::Result<RequestBuilder<'rb>> {
         RequestBuilder::new(method, url)
     }
 
diff --git a/rust/xpcom_async/src/sleep.rs b/rust/xpcom_async/src/sleep.rs
index a0db2570f4..41ffed2245 100644
--- a/rust/xpcom_async/src/sleep.rs
+++ b/rust/xpcom_async/src/sleep.rs
@@ -3,7 +3,9 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use std::{
-    cell::Cell, future::Future, task::{Poll, Waker}
+    cell::Cell,
+    future::Future,
+    task::{Poll, Waker},
 };
 
 use cstr::cstr;
@@ -53,7 +55,11 @@ impl SleepTimer {
         });
 
         unsafe {
-            timer.InitWithCallback(sleeper.coerce(), duration_in_ms, nsITimer::TYPE_ONE_SHOT as u32)
+            timer.InitWithCallback(
+                sleeper.coerce(),
+                duration_in_ms,
+                nsITimer::TYPE_ONE_SHOT as u32,
+            )
         }
         .to_result()?;