diff --git a/Cargo.lock b/Cargo.lock
index d58133418bf2..aeab948428af 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1457,7 +1457,7 @@ dependencies = [
 [[package]]
 name = "js"
 version = "0.1.6"
-source = "git+https://github.com/servo/rust-mozjs#3de4ff3d52361a47a17e3b4fcb02c779b99d93d4"
+source = "git+https://github.com/servo/rust-mozjs#cdb9570900b74cf4e0ba129eeb8bf527cee3ddb5"
 dependencies = [
  "cmake 0.1.22 (registry+https://github.com/rust-lang/crates.io-index)",
  "heapsize 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/components/script/dom/bindings/codegen/CodegenRust.py b/components/script/dom/bindings/codegen/CodegenRust.py
index feb39a532f6d..d0b5e678db8e 100644
--- a/components/script/dom/bindings/codegen/CodegenRust.py
+++ b/components/script/dom/bindings/codegen/CodegenRust.py
@@ -3660,17 +3660,18 @@ def jitInfoInitializer(isTypedMethod):
                     call: ${opName} as *const os::raw::c_void,
                     protoID: PrototypeList::ID::${name} as u16,
                     depth: ${depth},
-                    _bitfield_1:
-                        ((JSJitInfo_OpType::${opType} as u8 as u32) << 0) |
-                        ((JSJitInfo_AliasSet::${aliasSet} as u8 as u32) << 4) |
-                        ((JSValueType::${returnType} as u8 as u32) << 8) |
-                        ((${isInfallible} as u32) << 16) |
-                        ((${isMovable} as u32) << 17) |
-                        ((${isEliminatable} as u32) << 18) |
-                        ((${isAlwaysInSlot} as u32) << 19) |
-                        ((${isLazilyCachedInSlot} as u32) << 20) |
-                        ((${isTypedMethod} as u32) << 21) |
-                        ((${slotIndex} as u32) << 22)
+                    _bitfield_1: new_jsjitinfo_bitfield_1!(
+                        JSJitInfo_OpType::${opType} as u8,
+                        JSJitInfo_AliasSet::${aliasSet} as u8,
+                        JSValueType::${returnType} as u8,
+                        ${isInfallible},
+                        ${isMovable},
+                        ${isEliminatable},
+                        ${isAlwaysInSlot},
+                        ${isLazilyCachedInSlot},
+                        ${isTypedMethod},
+                        ${slotIndex},
+                    ),
                 }
                 """,
                 opName=opName,