diff --git a/Cargo.toml b/Cargo.toml
index 1601e47f..e75d30f8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,7 +14,7 @@ name = "bazel-diff"
 path = "src/main.rs"
 
 [features]
-default = ["vendored-protoc"]
+default = ["mimalloc", "vendored-protoc"]
 vendored-protoc = ["dep:protoc-bin-vendored"]
 
 [dependencies]
@@ -24,7 +24,7 @@ buffa = "0.9.1"
 clap = { version = "4.5", features = ["derive", "env"] }
 flate2 = "1.1"
 hex = "0.4"
-mimalloc = "0.1"
+mimalloc = { version = "0.1", optional = true }
 rayon = "1.10"
 rustls-pki-types = "1.15"
 rust-s3 = { version = "=0.36.0", default-features = false, features = ["sync-rustls-tls"] }
diff --git a/crate_deps.bzl b/crate_deps.bzl
index e2e718d3..a42e1089 100644
--- a/crate_deps.bzl
+++ b/crate_deps.bzl
@@ -32,6 +32,10 @@ def _deps(kinds):
         deps.extend(data[kind])
     return sorted(deps)
 
+def crate_features(exclude = []):
+    """Enabled Cargo features of the root package."""
+    return [feature for feature in _root_package()["crate_features"] if feature not in exclude]
+
 def normal_crate_deps():
     """Normal dependencies of the root Cargo package."""
     return _deps(["deps"])
diff --git a/src/BUILD b/src/BUILD
index a1d4e5f8..73e9e9b3 100644
--- a/src/BUILD
+++ b/src/BUILD
@@ -2,7 +2,7 @@ load("@rules_rs//rs:cargo_build_script.bzl", "cargo_build_script")
 load("@rules_rs//rs:rust_binary.bzl", "rust_binary")
 load("@rules_rs//rs:rust_library.bzl", "rust_library")
 load("@rules_rs//rs:rust_test.bzl", "rust_test")
-load("//:crate_deps.bzl", "normal_crate_deps")
+load("//:crate_deps.bzl", "crate_features", "normal_crate_deps")
 load("//tools/coverage:defs.bzl", "coverage_enforced_test")
 
 cargo_build_script(
@@ -39,9 +39,18 @@ rust_library(
     deps = normal_crate_deps() + [":build_script"],
 )
 
+config_setting(
+    name = "without_mimalloc",
+    values = {"features": "-mimalloc"},
+)
+
 rust_binary(
     name = "bazel-diff",
     srcs = ["main.rs"],
+    crate_features = select({
+        ":without_mimalloc": crate_features(exclude = ["mimalloc"]),
+        "//conditions:default": crate_features(),
+    }),
     crate_root = "main.rs",
     rustc_env = {
         "CARGO_PKG_VERSION": module_version() if module_version() else "unknown",
diff --git a/src/main.rs b/src/main.rs
index 1602a5cc..5e4dbe6c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -16,6 +16,7 @@ use std::path::{Path, PathBuf};
 use std::time::Duration;
 
 // Use mimalloc's per-thread heaps for parallel protobuf decoding in generate-hashes.
+#[cfg(feature = "mimalloc")]
 #[global_allocator]
 static GLOBAL: mimalloc::MiMalloc = mimalloc::MiMalloc;