diff --git a/poetry/version/markers.py b/poetry/version/markers.py
index 777309ec053..f8437348c05 100644
--- a/poetry/version/markers.py
+++ b/poetry/version/markers.py
@@ -629,7 +629,7 @@ def __hash__(self):
 
     def __str__(self):
         return " or ".join(
-            str(m) for m in self._markers if not m.is_any() or m.is_empty()
+            str(m) for m in self._markers if not m.is_any() and not m.is_empty()
         )
 
     def is_any(self):
diff --git a/tests/version/test_markers.py b/tests/version/test_markers.py
index e010dca44d3..98536e4e2c7 100644
--- a/tests/version/test_markers.py
+++ b/tests/version/test_markers.py
@@ -354,17 +354,32 @@ def test_marker_union_union_duplicates():
     )
 
 def test_marker_union_all_any():
-    m = parse_marker('')
+    union = MarkerUnion(
+        parse_marker(""),
+        parse_marker(""),
+    )
 
-    union = m.union(parse_marker(''))
     assert union.is_any()
 
 def test_marker_union_all_any():
-    m = parse_marker("<empty>")
+    union = MarkerUnion(
+        parse_marker("<empty>"),
+        parse_marker("<empty>"),
+    )
 
-    union = m.union(parse_marker("<empty>"))
     assert union.is_empty()
 
+def test_marker_str_conversion_skips_empty_and_any():
+    union = MarkerUnion(
+        parse_marker("<empty>"),
+        parse_marker('sys_platform == "darwin" or python_version <= "3.6" or os_name == "Windows"'),
+        parse_marker('')
+    )
+
+    assert str(union) == (
+        'sys_platform == "darwin" or python_version <= "3.6" or os_name == "Windows"'
+    )
+
 def test_intersect_compacts_constraints():
     m = parse_marker('python_version < "4.0"')