diff --git a/rust/riscv64.patch b/rust/riscv64.patch
index 7e8413eeb..023c0a1a6 100644
--- a/rust/riscv64.patch
+++ b/rust/riscv64.patch
@@ -1,5 +1,5 @@
 diff --git PKGBUILD PKGBUILD
-index 33307ea..9a63d1a 100644
+index df4805d..730bc90 100644
 --- PKGBUILD
 +++ PKGBUILD
 @@ -5,7 +5,7 @@
@@ -9,9 +9,9 @@ index 33307ea..9a63d1a 100644
 -pkgname=(rust lib32-rust-libs rust-musl rust-wasm rust-src)
 +pkgname=(rust rust-musl rust-wasm rust-src)
  epoch=1
- pkgver=1.63.0
+ pkgver=1.64.0
  pkgrel=1
-@@ -15,7 +15,7 @@ arch=(x86_64)
+@@ -15,24 +15,28 @@ arch=(x86_64)
  license=(MIT Apache)
  options=(!emptydirs !strip !lto)
  depends=(gcc-libs llvm-libs curl libssh2 gcc)
@@ -20,34 +20,40 @@ index 33307ea..9a63d1a 100644
               wasi-libc lld)
  checkdepends=(procps-ng gdb)
  source=(
-@@ -25,6 +25,7 @@ source=(
+   "https://static.rust-lang.org/dist/rustc-$pkgver-src.tar.gz"{,.asc}
++  "rust-1.64.0-regression.patch::https://github.com/rust-lang/rust/commit/263edd43c5255084292329423c61a9d69715ebfa.patch"
+   0001-cargo-Change-libexec-dir.patch
+   0001-bootstrap-Change-libexec-dir.patch
    0002-compiler-Change-LLVM-targets.patch
    0003-compiler-Use-wasm-ld-for-wasm-targets.patch
    remove-include-linux-fs.h.patch
 +  replace_patched_libc_cc.patch
  )
- sha256sums=('1f9580295642ef5da7e475a8da2397d65153d3f2cb92849dbd08ed0effca99d0'
+ sha256sums=('b3cd9f481e1a2901bf6f3808d30c69cc4ea80d93c4cc4e2ed52258b180381205'
              'SKIP'
-@@ -32,7 +33,8 @@ sha256sums=('1f9580295642ef5da7e475a8da2397d65153d3f2cb92849dbd08ed0effca99d0'
-             '7080a88e44234aa363ba6321f319c8d9621382dd9581748a43847dae005e55bd'
-             '5137df0a3399e279db4c5b83ae8e99d2c1977f62aec2f90521edb02f51597064'
-             '26bf232d144b81a303ed91f6a331ddf004c5d9fefd41a11e36b61812a34459aa'
++            '710a0f0f35da1951a3ae5eb63ed4a86e85eaf9a248ff56ef734d993a698bedd3'
+             'c901a9bb036c29ca092f7dbc8b447efdd9aa1044a902a88f9d024cb22681dc19'
+             '84ae2843d5ed83e9400e96d5f2d8cf3d1b89809bea76897c2762743460e06a87'
+             '1986e62bd2826eacaadd681e294943d890d75f24fd1f54fbd4015c3c622ac097'
+             '8fa64a2bdfb798184bde1c80d4775889a91d8b2ed076a6ea29ea99df9a2098cc'
 -            '34ed866e313e4580130a50118a4410d36fa0159123982521b6ef049439fc32ad')
 +            '34ed866e313e4580130a50118a4410d36fa0159123982521b6ef049439fc32ad'
 +            '908de2d6d84358289ff2667aca3360a3bc91cbe8d2687ee5b02474088282ff37')
  validpgpkeys=(108F66205EAEB0AAA8DD5E1C85AB96E6FA1BE5FE  # Rust Language (Tag and Release Signing Key) <rust-key@rust-lang.org>
                474E22316ABF4785A88C6E8EA2C794A986419D8A) # Tom Stellard <tstellar@redhat.com>
  
-@@ -53,6 +55,8 @@ prepare() {
+@@ -53,6 +57,10 @@ prepare() {
    # https://github.com/llvm/llvm-project/issues/56421
    patch -Np1 -d src/llvm-project < ../remove-include-linux-fs.h.patch
  
 +  patch -Np1 -i "../replace_patched_libc_cc.patch"
++
++  patch -Rp1 -i "../rust-1.64.0-regression.patch"
 +
    cat >config.toml <<END
  changelog-seen = 2
  profile = "user"
-@@ -62,9 +66,8 @@ link-shared = true
+@@ -62,9 +70,8 @@ link-shared = true
  
  [build]
  target = [
@@ -59,22 +65,33 @@ index 33307ea..9a63d1a 100644
    "wasm32-unknown-unknown",
    "wasm32-wasi",
  ]
-@@ -90,7 +93,6 @@ description = "Arch Linux $pkgbase $epoch:$pkgver-$pkgrel"
+@@ -90,7 +97,7 @@ description = "Arch Linux $pkgbase $epoch:$pkgver-$pkgrel"
  rpath = false
  backtrace-on-ice = true
  remap-debuginfo = true
 -jemalloc = true
++# jemalloc = true
  
  # LLVM crashes when passing an object through ThinLTO twice.  This is triggered
  # when using rust code in cross-language LTO if libstd was built using ThinLTO.
-@@ -104,12 +106,14 @@ deny-warnings = false
+@@ -104,22 +111,18 @@ deny-warnings = false
  [dist]
  compression-formats = ["gz"]
  
 -[target.x86_64-unknown-linux-gnu]
 +[target.riscv64gc-unknown-linux-gnu]
+ cc = "/usr/bin/gcc"
+ cxx = "/usr/bin/g++"
+ ar = "/usr/bin/gcc-ar"
+ ranlib = "/usr/bin/gcc-ranlib"
  llvm-config = "/usr/bin/llvm-config"
  
+-[target.i686-unknown-linux-gnu]
+-cc = "/usr/bin/gcc"
+-cxx = "/usr/bin/g++"
+-ar = "/usr/bin/gcc-ar"
+-ranlib = "/usr/bin/gcc-ranlib"
+-
 -[target.x86_64-unknown-linux-musl]
 +[target.riscv64gc-unknown-linux-musl]
  sanitizers = false
@@ -84,16 +101,17 @@ index 33307ea..9a63d1a 100644
  
  [target.wasm32-unknown-unknown]
  sanitizers = false
-@@ -120,6 +124,8 @@ sanitizers = false
+@@ -130,6 +133,9 @@ sanitizers = false
  profiler = false
  wasi-root = "/usr/share/wasi-sysroot"
  END
 +
-+  cargo update -p bootstrap
++  cd src/bootstrap
++  cargo update -p cc
  }
  
  _pick() {
-@@ -147,9 +153,7 @@ build() {
+@@ -157,9 +163,7 @@ build() {
  
    # rustbuild always installs copies of the shared libraries to /usr/lib,
    # overwrite them with symlinks to the per-architecture versions
@@ -104,7 +122,7 @@ index 33307ea..9a63d1a 100644
  
    mkdir -p usr/share/bash-completion
    mv etc/bash_completion.d usr/share/bash-completion/completions
-@@ -157,8 +161,7 @@ build() {
+@@ -167,8 +171,7 @@ build() {
    mkdir -p usr/share/licenses/rust
    mv -t usr/share/licenses/rust usr/share/doc/rust/{COPYRIGHT,LICENSE*}
  
@@ -114,7 +132,7 @@ index 33307ea..9a63d1a 100644
    _pick dest-wasm usr/lib/rustlib/wasm32-*
    _pick dest-src  usr/lib/rustlib/src
  }
-@@ -173,19 +176,6 @@ package_rust() {
+@@ -183,19 +186,6 @@ package_rust() {
    cp -a dest-rust/* "$pkgdir"
  }