diff --git a/codex-rs/exec/BUILD.bazel b/codex-rs/exec/BUILD.bazel
index 371520dcd980..6aec3e0b77a7 100644
--- a/codex-rs/exec/BUILD.bazel
+++ b/codex-rs/exec/BUILD.bazel
@@ -3,5 +3,8 @@ load("//:defs.bzl", "codex_rust_crate")
 codex_rust_crate(
     name = "exec",
     crate_name = "codex_exec",
+    test_shard_counts = {
+        "exec-all-test": 8,
+    },
     test_tags = ["no-sandbox"],
 )