diff --git a/.changeset/tasty-feet-complain.md b/.changeset/tasty-feet-complain.md
new file mode 100644
index 00000000..3f3972a4
--- /dev/null
+++ b/.changeset/tasty-feet-complain.md
@@ -0,0 +1,5 @@
+---
+"bob-the-bundler": minor
+---
+
+Ignore `__tests__` and `__testUtils__` from bundling
diff --git a/src/commands/build.ts b/src/commands/build.ts
index 6d5eadd6..5b22d90e 100644
--- a/src/commands/build.ts
+++ b/src/commands/build.ts
@@ -33,6 +33,8 @@ interface PackageInfo {
 const filesToExcludeFromDist = [
   "**/test/**",
   "**/tests/**",
+  "**/__tests__/**",
+  "**/__testUtils__/**",
   "**/*.spec.*",
   "**/*.test.*",
   "**/dist",