diff --git a/mozilla-1882291.patch b/mozilla-1882291.patch
new file mode 100644
index 0000000..f8f4a70
--- /dev/null
+++ b/mozilla-1882291.patch
@@ -0,0 +1,62 @@
+
+# HG changeset patch
+# User Jeff Muizelaar <jmuizelaar@mozilla.com>
+# Date 1709608348 0
+# Node ID e9b01ce8e2fe053ffef77505f05cf18ed0b9fcd2
+# Parent  171664703051d94e1be995b74ad97a9dff5beea5
+Bug 1882291. Switch to stdarch_arm_neon_intrinsics feature on rust >=1.78. r=glandium
+
+We only need this on ARM32 because the ARM64 intrinsics are stable.
+
+stdarch_arm_neon_intrinsics was split out from stdsimd here:
+https://github.com/rust-lang/stdarch/pull/1486
+
+Differential Revision: https://phabricator.services.mozilla.com/D203039
+
+erAck: backported to 115.11.0
+
+--- thunderbird-115.11.0/Cargo.lock.mozilla-1882291	2024-05-15 19:13:32.470620205 +0200
++++ thunderbird-115.11.0/Cargo.lock	2024-05-15 19:16:06.064291008 +0200
+@@ -4276,6 +4276,7 @@ name = "qcms"
+ version = "0.2.0"
+ dependencies = [
+  "libc",
++ "version_check",
+ ]
+ 
+ [[package]]
+--- thunderbird-115.11.0/gfx/qcms/build.rs.mozilla-1882291	2024-05-15 19:13:32.494620154 +0200
++++ thunderbird-115.11.0/gfx/qcms/build.rs	2024-05-15 19:13:32.494620154 +0200
+@@ -0,0 +1,7 @@
++extern crate version_check as rustc;
++
++fn main() {
++    if rustc::is_min_version("1.78.0").unwrap_or(false) {
++        println!("cargo:rustc-cfg=stdsimd_split");
++    }
++}
+--- thunderbird-115.11.0/gfx/qcms/Cargo.toml.mozilla-1882291	2024-05-13 17:06:54.000000000 +0200
++++ thunderbird-115.11.0/gfx/qcms/Cargo.toml	2024-05-15 19:13:32.470620205 +0200
+@@ -20,3 +20,6 @@ cmyk = []
+ 
+ [dependencies]
+ libc = {version = "0.2", optional = true }
++
++[build-dependencies]
++version_check = "0.9"
+--- thunderbird-115.11.0/gfx/qcms/src/lib.rs.mozilla-1882291	2024-05-13 17:06:54.000000000 +0200
++++ thunderbird-115.11.0/gfx/qcms/src/lib.rs	2024-05-15 19:13:32.495620152 +0200
+@@ -7,9 +7,11 @@
+ #![allow(non_upper_case_globals)]
+ // These are needed for the neon SIMD code and can be removed once the MSRV supports the
+ // instrinsics we use
+-#![cfg_attr(feature = "neon", feature(stdsimd))]
++#![cfg_attr(all(stdsimd_split, target_arch = "arm", feature = "neon"), feature(stdarch_arm_neon_intrinsics))]
++#![cfg_attr(all(stdsimd_split, target_arch = "arm", feature = "neon"), feature(stdarch_arm_feature_detection))]
++#![cfg_attr(all(not(stdsimd_split), target_arch = "arm", feature = "neon"), feature(stdsimd))]
+ #![cfg_attr(
+-    feature = "neon",
++    all(target_arch = "arm", feature = "neon"),
+     feature(arm_target_feature, raw_ref_op)
+ 
+ )]
diff --git a/thunderbird.spec b/thunderbird.spec
index 3fff072..1e3e7e5 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -110,6 +110,8 @@ Patch103:       rhbz-1219542-s390-build.patch
 Patch422:       0001-GLIBCXX-fix-for-GCC-12.patch
 Patch425:       build-disable-elfhack.patch
 Patch426:       build-rnp.patch
+# Rust feature(stdsimd) unknown
+Patch427:       mozilla-1882291.patch
 
 # PPC fix
 Patch304:       mozilla-1245783.patch
@@ -189,6 +191,7 @@ Provides:       thunderbird-lightning
 Obsoletes:      thunderbird-lightning-gdata <= 1:3.3.0.14
 BuildRequires:  rust
 BuildRequires:  cargo
+BuildRequires:  rust-version_check-devel
 BuildRequires:  clang-devel
 BuildRequires:  python3.11-devel
 %if !0%{?use_bundled_cbindgen}
@@ -281,6 +284,7 @@ debug %{name}, you want to install %{name}-debuginfo instead.
 %patch -P 425 -p1 -b .build-disable-elfhack
 %endif
 %patch -P 426 -p1 -b .build-rnp
+%patch -P 427 -p1 -b .mozilla-1882291
 # most likely fixed
 #%patch -P 419 -p1 -b .bindgen