diff --git a/src/poetry/packages/locker.py b/src/poetry/packages/locker.py
index f87c490d70f..20645c7fec6 100644
--- a/src/poetry/packages/locker.py
+++ b/src/poetry/packages/locker.py
@@ -574,7 +574,7 @@ def _dump_package(
         if package.extras:
             extras = {}
             for name, deps in sorted(package.extras.items()):
-                extras[name] = sorted(dep.base_pep_508_name for dep in deps)
+                extras[name] = sorted(dep.to_pep_508(with_extras=False) for dep in deps)
 
             data["extras"] = extras
 
diff --git a/tests/installation/fixtures/with-pypi-repository.test b/tests/installation/fixtures/with-pypi-repository.test
index ce79893c9a8..85534e2aa53 100644
--- a/tests/installation/fixtures/with-pypi-repository.test
+++ b/tests/installation/fixtures/with-pypi-repository.test
@@ -106,7 +106,7 @@ files = [
 
 [package.extras]
 docs = ["furo", "jaraco.packaging (>=9)", "jaraco.tidelift (>=1.4)", "pygments-github-lexers (==0.0.5)", "rst.linker (>=1.9)", "sphinx (>=3.5)", "sphinx-favicon", "sphinx-hoverxref (<2)", "sphinx-inline-tabs", "sphinx-lint", "sphinx-notfound-page (==0.8.3)", "sphinx-reredirects", "sphinxcontrib-towncrier"]
-testing = ["build[virtualenv]", "filelock (>=3.4.0)", "flake8 (<5)", "flake8-2020", "ini2toml[lite] (>=0.9)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "pip (>=19.1)", "pip-run (>=8.8)", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)", "pytest-perf", "pytest-timeout", "pytest-xdist", "tomli-w (>=1.0.0)", "virtualenv (>=13.0.0)", "wheel"]
+testing = ["build[virtualenv]", "filelock (>=3.4.0)", "flake8 (<5)", "flake8-2020", "ini2toml[lite] (>=0.9)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "pip (>=19.1)", "pip-run (>=8.8)", "pytest (>=6)", "pytest-black (>=0.3.7) ; platform_python_implementation != \"PyPy\"", "pytest-checkdocs (>=2.4)", "pytest-cov ; platform_python_implementation != \"PyPy\"", "pytest-enabler (>=1.3)", "pytest-flake8 ; python_version < \"3.12\"", "pytest-mypy (>=0.9.1) ; platform_python_implementation != \"PyPy\"", "pytest-perf", "pytest-timeout", "pytest-xdist", "tomli-w (>=1.0.0)", "virtualenv (>=13.0.0)", "wheel"]
 testing-integration = ["build[virtualenv]", "filelock (>=3.4.0)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "pytest", "pytest-enabler", "pytest-xdist", "tomli", "virtualenv (>=13.0.0)", "wheel"]
 
 [[package]]
diff --git a/tests/packages/test_locker.py b/tests/packages/test_locker.py
index 89623cb62ec..7dce9bfeebf 100644
--- a/tests/packages/test_locker.py
+++ b/tests/packages/test_locker.py
@@ -1293,6 +1293,100 @@ def test_locker_dumps_dependency_extras_in_correct_order(
     assert content == expected
 
 
+def test_locker_dumps_extras_with_constraints(
+    locker: Locker,
+    root: ProjectPackage,
+    fixture_base: Path,
+    transitive_info: TransitivePackageInfo,
+) -> None:
+    package_a = get_package("A", "1.0.0")
+
+    package_httpx_new = Factory.create_dependency(
+        "httpx",
+        {"version": "2.0.0", "python": ">=3.7", "extras": ["brotli"]},
+        root_dir=fixture_base,
+    )
+
+    package_httpx_old = Factory.create_dependency(
+        "httpx", {"version": "1.0.0", "python": "<3.7"}, root_dir=fixture_base
+    )
+
+    package_a.extras = {
+        canonicalize_name("http"): [package_httpx_new, package_httpx_old],
+    }
+
+    locker.set_lock_data(root, {package_a: transitive_info})
+
+    with locker.lock.open(encoding="utf-8") as f:
+        content = f.read()
+
+    expected = f"""\
+# {GENERATED_COMMENT}
+
+[[package]]
+name = "A"
+version = "1.0.0"
+description = ""
+optional = false
+python-versions = "*"
+groups = ["main"]
+files = []
+
+[package.extras]
+http = ["httpx (==1.0.0) ; python_version < \\"3.7\\"", "httpx[brotli] (==2.0.0) ; python_version >= \\"3.7\\""]
+
+[metadata]
+lock-version = "2.1"
+python-versions = "*"
+content-hash = "115cf985d932e9bf5f540555bbdd75decbb62cac81e399375fc19f6277f8c1d8"
+"""
+
+    assert content == expected
+
+
+def test_locker_properly_loads_extras_with_constraints(locker: Locker) -> None:
+    content = f"""\
+# {GENERATED_COMMENT}
+
+[[package]]
+name = "A"
+version = "1.0.0"
+description = ""
+optional = false
+python-versions = "*"
+groups = ["main"]
+files = []
+
+[package.extras]
+http = ["httpx (==1.0.0) ; python_version < \\"3.7\\"", "httpx[brotli] (==2.0.0) ; python_version >= \\"3.7\\""]
+
+[metadata]
+lock-version = "2.1"
+python-versions = "*"
+content-hash = "115cf985d932e9bf5f540555bbdd75decbb62cac81e399375fc19f6277f8c1d8"
+"""
+
+    with open(locker.lock, "w", encoding="utf-8") as f:
+        f.write(content)
+
+    packages = locker.locked_repository().packages
+
+    assert len(packages) == 1
+
+    package = packages[0]
+    assert len(package.extras) == 1
+
+    httpx_deps = package.extras[canonicalize_name("http")]
+    assert len(httpx_deps) == 2
+
+    assert httpx_deps[0].constraint == Version.parse("1.0.0")
+    assert str(httpx_deps[0].python_constraint) == "<3.7"
+
+    assert httpx_deps[1].constraint == Version.parse("2.0.0")
+    assert str(httpx_deps[1].python_constraint) == ">=3.7"
+    assert httpx_deps[1].extras == {"brotli"}
+
+
 def test_locked_repository_uses_root_dir_of_package(
     locker: Locker, mocker: MockerFixture
 ) -> None: