diff --git a/README.md b/README.md
index b6218cf2a2b..7be809371ed 100644
--- a/README.md
+++ b/README.md
@@ -100,8 +100,8 @@ Options:
                               directories that should be excluded on
                               recursive searches. On Windows, use forward
                               slashes for directories.  [default:
-                              build/|buck-out/|dist/|_build/|\.git/|\.hg/|
-                              \.mypy_cache/|\.nox/|\.tox/|\.venv/]
+                              build/|buck-out/|dist/|_build/|\.eggs/|\.git/|
+                              \.hg/|\.mypy_cache/|\.nox/|\.tox/|\.venv/]
   -q, --quiet                 Don't emit non-error messages to stderr. Errors
                               are still emitted, silence those with
                               2>/dev/null.
@@ -573,7 +573,8 @@ py36 = true
 include = '\.pyi?$'
 exclude = '''
 /(
-    \.git
+    \.eggs
+  | \.git
   | \.hg
   | \.mypy_cache
   | \.tox
diff --git a/black.py b/black.py
index fd0364ba8d5..c1cc08021f3 100644
--- a/black.py
+++ b/black.py
@@ -51,7 +51,7 @@
 __version__ = "18.9b0"
 DEFAULT_LINE_LENGTH = 88
 DEFAULT_EXCLUDES = (
-    r"/(\.git|\.hg|\.mypy_cache|\.nox|\.tox|\.venv|_build|buck-out|build|dist)/"
+    r"/(\.eggs|\.git|\.hg|\.mypy_cache|\.nox|\.tox|\.venv|_build|buck-out|build|dist)/"
 )
 DEFAULT_INCLUDES = r"\.pyi?$"
 CACHE_DIR = Path(user_cache_dir("black", version=__version__))
diff --git a/pyproject.toml b/pyproject.toml
index 6ac19bc3457..fca50554ed3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,7 +11,8 @@ py36 = true
 include = '\.pyi?$'
 exclude = '''
 /(
-    \.git
+    \.eggs
+  | \.git
   | \.hg
   | \.mypy_cache
   | \.tox