diff --git a/poetry/core/packages/__init__.py b/poetry/core/packages/__init__.py
index f86a24b96..16854c530 100644
--- a/poetry/core/packages/__init__.py
+++ b/poetry/core/packages/__init__.py
@@ -63,8 +63,8 @@ def dependency_from_pep_508(
     name = parts[0].strip()
     if len(parts) > 1:
         rest = parts[1]
-        if ";" in rest:
-            name += ";" + rest.split(";", 1)[1]
+        if " ;" in rest:
+            name += " ;" + rest.split(" ;", 1)[1]
 
     req = Requirement(name)
 
diff --git a/poetry/core/utils/helpers.py b/poetry/core/utils/helpers.py
index c3e13f558..c4fe56741 100644
--- a/poetry/core/utils/helpers.py
+++ b/poetry/core/utils/helpers.py
@@ -81,7 +81,7 @@ def parse_requires(requires):  # type: (str) -> List[str]
             continue
 
         if current_marker:
-            line = "{}; {}".format(line, current_marker)
+            line = "{} ; {}".format(line, current_marker)
 
         requires_dist.append(line)
 
diff --git a/tests/conftest.py b/tests/conftest.py
index 1269d5bab..b70a906b4 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -3,7 +3,7 @@
 import pytest
 
 from poetry.core.utils._compat import Path
-from tests.utils import tempfile
+from tests.testutils import tempfile
 
 
 def pytest_addoption(parser):
diff --git a/tests/integration/test_pep517.py b/tests/integration/test_pep517.py
index 0ef13e21d..568c1004a 100644
--- a/tests/integration/test_pep517.py
+++ b/tests/integration/test_pep517.py
@@ -6,8 +6,8 @@
 from pep517.check import check
 from poetry.core.utils._compat import PY35
 from poetry.core.utils._compat import Path
-from tests.utils import subprocess_run
-from tests.utils import temporary_project_directory
+from tests.testutils import subprocess_run
+from tests.testutils import temporary_project_directory
 
 
 pytestmark = pytest.mark.integration
diff --git a/tests/packages/test_main.py b/tests/packages/test_main.py
index 238f8c497..92731b187 100644
--- a/tests/packages/test_main.py
+++ b/tests/packages/test_main.py
@@ -183,6 +183,22 @@ def test_dependency_from_pep_508_with_git_url():
     assert "1.2" == dep.reference
 
 
+def test_dependency_from_pep_508_with_git_url_and_comment_and_extra():
+    name = (
+        "poetry @ git+https://github.com/python-poetry/poetry.git@b;ar;#egg=poetry"
+        ' ; extra == "foo;"'
+    )
+
+    dep = dependency_from_pep_508(name)
+
+    assert "poetry" == dep.name
+    assert dep.is_vcs()
+    assert "git" == dep.vcs
+    assert "https://github.com/python-poetry/poetry.git" == dep.source
+    assert "b;ar;" == dep.reference
+    assert dep.in_extras == ["foo;"]
+
+
 def test_dependency_from_pep_508_with_url():
     name = "django-utils @ https://example.com/django-utils-1.0.0.tar.gz"
 
diff --git a/tests/utils.py b/tests/testutils.py
similarity index 100%
rename from tests/utils.py
rename to tests/testutils.py
diff --git a/tests/utils/__init__.py b/tests/utils/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/tests/utils/test_helpers.py b/tests/utils/test_helpers.py
new file mode 100644
index 000000000..a2e423c1d
--- /dev/null
+++ b/tests/utils/test_helpers.py
@@ -0,0 +1,54 @@
+from poetry.core.utils.helpers import parse_requires
+
+
+def test_parse_requires():
+    requires = """\
+jsonschema>=2.6.0.0,<3.0.0.0
+lockfile>=0.12.0.0,<0.13.0.0
+pip-tools>=1.11.0.0,<2.0.0.0
+pkginfo>=1.4.0.0,<2.0.0.0
+pyrsistent>=0.14.2.0,<0.15.0.0
+toml>=0.9.0.0,<0.10.0.0
+cleo>=0.6.0.0,<0.7.0.0
+cachy>=0.1.1.0,<0.2.0.0
+cachecontrol>=0.12.4.0,<0.13.0.0
+requests>=2.18.0.0,<3.0.0.0
+msgpack-python>=0.5.0.0,<0.6.0.0
+pyparsing>=2.2.0.0,<3.0.0.0
+requests-toolbelt>=0.8.0.0,<0.9.0.0
+
+[:(python_version >= "2.7.0.0" and python_version < "2.8.0.0") or (python_version >= "3.4.0.0" and python_version < "3.5.0.0")]
+typing>=3.6.0.0,<4.0.0.0
+
+[:python_version >= "2.7.0.0" and python_version < "2.8.0.0"]
+virtualenv>=15.2.0.0,<16.0.0.0
+pathlib2>=2.3.0.0,<3.0.0.0
+
+[:python_version >= "3.4.0.0" and python_version < "3.6.0.0"]
+zipfile36>=0.1.0.0,<0.2.0.0
+
+[dev]
+isort@ git+git://github.com/timothycrosley/isort.git@e63ae06ec7d70b06df9e528357650281a3d3ec22#egg=isort
+"""
+    result = parse_requires(requires)
+    expected = [
+        "jsonschema>=2.6.0.0,<3.0.0.0",
+        "lockfile>=0.12.0.0,<0.13.0.0",
+        "pip-tools>=1.11.0.0,<2.0.0.0",
+        "pkginfo>=1.4.0.0,<2.0.0.0",
+        "pyrsistent>=0.14.2.0,<0.15.0.0",
+        "toml>=0.9.0.0,<0.10.0.0",
+        "cleo>=0.6.0.0,<0.7.0.0",
+        "cachy>=0.1.1.0,<0.2.0.0",
+        "cachecontrol>=0.12.4.0,<0.13.0.0",
+        "requests>=2.18.0.0,<3.0.0.0",
+        "msgpack-python>=0.5.0.0,<0.6.0.0",
+        "pyparsing>=2.2.0.0,<3.0.0.0",
+        "requests-toolbelt>=0.8.0.0,<0.9.0.0",
+        'typing>=3.6.0.0,<4.0.0.0 ; (python_version >= "2.7.0.0" and python_version < "2.8.0.0") or (python_version >= "3.4.0.0" and python_version < "3.5.0.0")',
+        'virtualenv>=15.2.0.0,<16.0.0.0 ; python_version >= "2.7.0.0" and python_version < "2.8.0.0"',
+        'pathlib2>=2.3.0.0,<3.0.0.0 ; python_version >= "2.7.0.0" and python_version < "2.8.0.0"',
+        'zipfile36>=0.1.0.0,<0.2.0.0 ; python_version >= "3.4.0.0" and python_version < "3.6.0.0"',
+        'isort@ git+git://github.com/timothycrosley/isort.git@e63ae06ec7d70b06df9e528357650281a3d3ec22#egg=isort ; extra == "dev"',
+    ]
+    assert result == expected