diff --git a/poetry/core/packages/dependency.py b/poetry/core/packages/dependency.py
index 6e06bc6fa..aa75e3e2f 100644
--- a/poetry/core/packages/dependency.py
+++ b/poetry/core/packages/dependency.py
@@ -262,7 +262,7 @@ def to_pep_508(self, with_extras: bool = True) -> str:
             )
 
         if markers:
-            if self.is_vcs() or self.is_url():
+            if self.is_vcs() or self.is_url() or self.is_file():
                 requirement += " "
 
             if len(markers) > 1:
diff --git a/tests/packages/test_file_dependency.py b/tests/packages/test_file_dependency.py
index 3abe20f88..8315594ca 100644
--- a/tests/packages/test_file_dependency.py
+++ b/tests/packages/test_file_dependency.py
@@ -4,6 +4,7 @@
 
 from poetry.core.packages.dependency import Dependency
 from poetry.core.packages.file_dependency import FileDependency
+from poetry.core.version.markers import SingleMarker
 
 
 DIST_PATH = Path(__file__).parent.parent / "fixtures" / "distributions"
@@ -20,7 +21,7 @@ def test_file_dependency_dir():
 
 
 def _test_file_dependency_pep_508(
-    mocker, name, path, pep_508_input, pep_508_output=None
+    mocker, name, path, pep_508_input, pep_508_output=None, marker=None
 ):
     mocker.patch.object(Path, "exists").return_value = True
     mocker.patch.object(Path, "is_file").return_value = True
@@ -28,6 +29,8 @@ def _test_file_dependency_pep_508(
     dep = Dependency.create_from_pep_508(
         pep_508_input, relative_to=Path(__file__).parent
     )
+    if marker:
+        dep.marker = marker
 
     assert dep.is_file()
     assert dep.name == name
@@ -62,3 +65,35 @@ def test_file_dependency_pep_508_local_file_relative_path(mocker):
 
     requirement = "{} @ {}".format("demo", path)
     _test_file_dependency_pep_508(mocker, "demo", path, requirement)
+
+
+def test_absolute_file_dependency_to_pep_508_with_marker(mocker):
+    wheel = "demo-0.1.0-py2.py3-none-any.whl"
+
+    abs_path = DIST_PATH / wheel
+    requirement = '{} @ file://{} ; sys_platform == "linux"'.format(
+        "demo", abs_path.as_posix()
+    )
+    _test_file_dependency_pep_508(
+        mocker,
+        "demo",
+        abs_path,
+        requirement,
+        marker=SingleMarker("sys.platform", "linux"),
+    )
+
+
+def test_relative_file_dependency_to_pep_508_with_marker(mocker):
+    wheel = "demo-0.1.0-py2.py3-none-any.whl"
+
+    rel_path = Path("..") / "fixtures" / "distributions" / wheel
+    requirement = '{} @ {} ; sys_platform == "linux"'.format(
+        "demo", rel_path.as_posix()
+    )
+    _test_file_dependency_pep_508(
+        mocker,
+        "demo",
+        rel_path,
+        requirement,
+        marker=SingleMarker("sys.platform", "linux"),
+    )