diff --git a/CHANGELOG.md b/CHANGELOG.md
index ce5fb6b5..7c560ae7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,8 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 ## [Unreleased]
 
 - cargo-llvm-cov no longer changes the current directory when running cargo. ([#161](https://github.com/taiki-e/cargo-llvm-cov/pull/161))
+- Exclude build script from report by default. ([#163](https://github.com/taiki-e/cargo-llvm-cov/pull/163))
+  You can use `--include-build-script` flag to include build script in report.
 
 ## [0.3.3] - 2022-05-06
 
diff --git a/README.md b/README.md
index ead93040..63f652d7 100644
--- a/README.md
+++ b/README.md
@@ -129,6 +129,9 @@ OPTIONS:
         --show-missing-lines
             Show lines with no coverage
 
+        --include-build-script
+            Include build script in coverage report
+
         --doctests
             Including doc tests (unstable)
 
diff --git a/src/cli.rs b/src/cli.rs
index 2a9a8c35..604ec3f5 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -319,6 +319,9 @@ pub(crate) struct LlvmCovOptions {
     /// Show lines with no coverage.
     #[clap(long)]
     pub(crate) show_missing_lines: bool,
+    /// Include build script in coverage report.
+    #[clap(long)]
+    pub(crate) include_build_script: bool,
 }
 
 impl LlvmCovOptions {
diff --git a/src/main.rs b/src/main.rs
index d2b69ff1..7d1201ab 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -448,8 +448,12 @@ fn object_files(cx: &Context) -> Result<Vec<OsString>> {
                     if stem == "build-script-build" || stem.starts_with("build_script_build-") {
                         let p = p.parent().unwrap();
                         if p.parent().unwrap().file_name().unwrap() == "build" {
-                            let dir = p.file_name().unwrap().to_string_lossy();
-                            if !cx.build_script_re.is_match(&dir) {
+                            if cx.cov.include_build_script {
+                                let dir = p.file_name().unwrap().to_string_lossy();
+                                if !cx.build_script_re.is_match(&dir) {
+                                    return false;
+                                }
+                            } else {
                                 return false;
                             }
                         }
diff --git a/tests/long-help.txt b/tests/long-help.txt
index 42b4e140..206f79e2 100644
--- a/tests/long-help.txt
+++ b/tests/long-help.txt
@@ -88,6 +88,9 @@ OPTIONS:
         --show-missing-lines
             Show lines with no coverage
 
+        --include-build-script
+            Include build script in coverage report
+
         --doctests
             Including doc tests (unstable)
 
diff --git a/tests/short-help.txt b/tests/short-help.txt
index d3a3e80f..76495e8c 100644
--- a/tests/short-help.txt
+++ b/tests/short-help.txt
@@ -56,6 +56,9 @@ OPTIONS:
         --show-missing-lines
             Show lines with no coverage
 
+        --include-build-script
+            Include build script in coverage report
+
         --doctests
             Including doc tests (unstable)