diff --git a/poetry/semver/__init__.py b/poetry/semver/__init__.py
index 58ca3a1edc3..725b7d43f58 100644
--- a/poetry/semver/__init__.py
+++ b/poetry/semver/__init__.py
@@ -76,14 +76,12 @@ def parse_single_constraint(constraint):  # type: (str) -> VersionConstraint
         version = Version.parse(m.group(1))
 
         if precision == 2:
-            low = version
             high = version.stable.next_major
         else:
-            low = Version(version.major, version.minor, version.patch)
             high = version.stable.next_minor
 
         return VersionRange(
-            low, high, include_min=True, always_include_max_prerelease=True
+            version, high, include_min=True, always_include_max_prerelease=True
         )
 
     # Caret range
diff --git a/tests/semver/test_main.py b/tests/semver/test_main.py
index 654a54a5281..4610e8d4573 100644
--- a/tests/semver/test_main.py
+++ b/tests/semver/test_main.py
@@ -68,6 +68,10 @@ def test_parse_constraint_wildcard(input, constraint):
         ("~3.5", VersionRange(Version(3, 5, 0), Version(3, 6, 0), True)),
         ("~=3.5", VersionRange(Version(3, 5, 0), Version(4, 0, 0), True)),  # PEP 440
         ("~=3.5.3", VersionRange(Version(3, 5, 3), Version(3, 6, 0), True)),  # PEP 440
+        (
+            "~=3.5.3rc1",
+            VersionRange(Version(3, 5, 3, pre="rc1"), Version(3, 6, 0), True),
+        ),  # PEP 440
     ],
 )
 def test_parse_constraint_tilde(input, constraint):