diff --git a/Cargo.lock b/Cargo.lock
index f51b55da57f4..437b22bd950c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3941,7 +3941,7 @@ source = "git+https://github.com/mozilla/application-services?rev=1a59041d0c7d36
 name = "nsstring"
 version = "0.1.0"
 dependencies = [
- "bitflags 1.999.999",
+ "bitflags 2.4.0",
  "encoding_rs",
 ]
 
diff --git a/xpcom/rust/nsstring/Cargo.toml b/xpcom/rust/nsstring/Cargo.toml
index c2f8e34b457b..7d4b3e545640 100644
--- a/xpcom/rust/nsstring/Cargo.toml
+++ b/xpcom/rust/nsstring/Cargo.toml
@@ -10,5 +10,5 @@ edition = "2018"
 gecko_debug = []
 
 [dependencies]
-bitflags = "1.0"
+bitflags = "2"
 encoding_rs = "0.8.0"
diff --git a/xpcom/rust/nsstring/src/lib.rs b/xpcom/rust/nsstring/src/lib.rs
index 521c2c8c04fe..64d50df8fe91 100644
--- a/xpcom/rust/nsstring/src/lib.rs
+++ b/xpcom/rust/nsstring/src/lib.rs
@@ -157,6 +157,7 @@ bitflags! {
     // While this has the same layout as u16, it cannot be passed
     // over FFI safely as a u16.
     #[repr(C)]
+    #[derive(Debug, Copy, PartialEq, Eq, Clone, PartialOrd, Ord, Hash)]
     struct DataFlags: u16 {
         const TERMINATED = 1 << 0; // IsTerminated returns true
         const VOIDED = 1 << 1; // IsVoid returns true
@@ -172,6 +173,7 @@ bitflags! {
     // While this has the same layout as u16, it cannot be passed
     // over FFI safely as a u16.
     #[repr(C)]
+    #[derive(Debug, Copy, PartialEq, Eq, Clone, PartialOrd, Ord, Hash)]
     struct ClassFlags: u16 {
         const INLINE = 1 << 0; // |this|'s buffer is inline
         const NULL_TERMINATED = 1 << 1; // |this| requires its buffer is null-terminated