diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index c2a0ca2..ebb1659 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -45,9 +45,9 @@ jobs:
             target: x86_64
           - runner: ubuntu-22.04
             target: x86
-          - runner: ubuntu-22.04
+          - runner: ubuntu-22.04-arm
             target: aarch64
-          - runner: ubuntu-22.04
+          - runner: ubuntu-22.04-arm
             target: armv7
           - runner: ubuntu-22.04
             target: ppc64le
@@ -58,9 +58,6 @@ jobs:
           python-version: 3.x
       - name: Build wheels
         uses: PyO3/maturin-action@db323e2cf5679b7feb8bcb561a36b27a0bc19e79 # v1
-        env:
-          # Ensure ring's ARM assembly sees an explicit architecture on aarch64 (glibc)
-          CFLAGS_aarch64_unknown_linux_gnu: -D__ARM_ARCH=8
         with:
           target: ${{ matrix.platform.target }}
           args: --release --out dist --find-interpreter
@@ -83,9 +80,9 @@ jobs:
             target: x86_64
           - runner: ubuntu-22.04
             target: x86
-          - runner: ubuntu-22.04
+          - runner: ubuntu-22.04-arm
             target: aarch64
-          - runner: ubuntu-22.04
+          - runner: ubuntu-22.04-arm
             target: armv7
     steps:
       - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
@@ -94,9 +91,6 @@ jobs:
           python-version: 3.x
       - name: Build wheels
         uses: PyO3/maturin-action@db323e2cf5679b7feb8bcb561a36b27a0bc19e79 # v1
-        env:
-          # Ensure ring's ARM assembly sees an explicit architecture on aarch64 (musl)
-          CFLAGS_aarch64_unknown_linux_musl: -D__ARM_ARCH=8
         with:
           target: ${{ matrix.platform.target }}
           args: --release --out dist --find-interpreter
diff --git a/src/tiktoken.rs b/src/tiktoken.rs
index 9c5a290..f4eb1bc 100644
--- a/src/tiktoken.rs
+++ b/src/tiktoken.rs
@@ -305,12 +305,7 @@ impl CoreBPE {
             let token_is_all_space = |token| {
                 self.decoder
                     .get(token)
-                    .map(|token_bytes| {
-                        token_bytes
-                            .iter()
-                            .rev()
-                            .all(|&b| [b' ', b'\n', b'\t'].contains(&b))
-                    })
+                    .map(|token_bytes| token_bytes.iter().rev().all(|&b| b" \n\t".contains(&b)))
                     .unwrap_or(false)
             };
             if last_piece_token_len > 0