diff --git a/scripts/vendored-checksums.txt b/scripts/vendored-checksums.txt
index 092f46f2e..176f96d1e 100644
--- a/scripts/vendored-checksums.txt
+++ b/scripts/vendored-checksums.txt
@@ -5,7 +5,7 @@ c5cfb43042b6b72045f4ba997834d0a7786d2793d91680868b5815b39f14fc78  internal/cbm/v
 b29c1c9fb7cc82f58c84b376df1297d6e2737a1d655fd356db0859e3c29c2fea  internal/cbm/vendored/common/tree_sitter/alloc.h
 31e60a1bff6f715afacce03b5b70efe42b58371b4f9595dd4af52a577ff9608c  internal/cbm/vendored/common/tree_sitter/array.h
 180b893c8734778fd32f372dfbc27bd6ad1cd2221f26150b31256ff6716320d2  internal/cbm/vendored/common/tree_sitter/parser.h
-00a84162eb34fb58bcdd38c08922d4fea4c87b7c2219dd64b773dd15ba18de71  internal/cbm/vendored/grammars/MANIFEST.md
+a66a04ed735fdb3d4a90ee4353b8f0490dc0360da5965b0d13ec5d6766f146fa  internal/cbm/vendored/grammars/MANIFEST.md
 ad8425038de519f8c4e3e9339feebf99dfad8a6002dcf79227d91402780a32cc  internal/cbm/vendored/grammars/ada/LICENSE
 02805ec13939b749c891567be36bf024b09034e04c80683a1ae667272458d549  internal/cbm/vendored/grammars/ada/parser.c
 115a75d000bef9c70c4de7dfbb7f2a80b90cbb14ba265056dc7abb1ef3b9b6db  internal/cbm/vendored/grammars/ada/tree_sitter/alloc.h
diff --git a/src/foundation/mem_override_libc.c b/src/foundation/mem_override_libc.c
index 257258a4d..4e320f23c 100644
--- a/src/foundation/mem_override_libc.c
+++ b/src/foundation/mem_override_libc.c
@@ -140,8 +140,15 @@ __attribute__((constructor(101))) static void libc_resolve(void) {
  * constructor resolves its own target once. */
 #define RESOLVED(ptr, name) ((ptr) ? (ptr) : ((ptr) = dlsym(RTLD_NEXT, name)))
 
-__attribute__((no_builtin("memcpy", "memmove",
-                          "memset"))) static void *slow_move(void *d, const void *s, size_t n) {
+/* Spelled through a macro only because the three builtin names plus this
+ * signature come to 117 columns, and a wrapped attribute is the one thing
+ * clang-format 20 and 22 lay out differently -- CI runs 20, the local lane runs
+ * Homebrew's 22, so the wrapped form passed here and failed there. Fitting the
+ * line under the 100-column limit leaves no wrapping decision to disagree on.
+ * The siblings below fit as they are and stay inline. */
+#define NO_BUILTIN_MEM __attribute__((no_builtin("memcpy", "memmove", "memset")))
+
+NO_BUILTIN_MEM static void *slow_move(void *d, const void *s, size_t n) {
     unsigned char *dd = (unsigned char *)d;
     const unsigned char *ss = (const unsigned char *)s;
     if (dd < ss) {