diff --git a/redis/connection.py b/redis/connection.py
index 3438bafe57..96645ba355 100755
--- a/redis/connection.py
+++ b/redis/connection.py
@@ -1166,6 +1166,16 @@ def to_bool(value):
 
 
 def parse_url(url):
+    if not (
+        url.startswith("redis://")
+        or url.startswith("rediss://")
+        or url.startswith("unix://")
+    ):
+        raise ValueError(
+            "Redis URL must specify one of the following "
+            "schemes (redis://, rediss://, unix://)"
+        )
+
     url = urlparse(url)
     kwargs = {}
 
@@ -1192,7 +1202,7 @@ def parse_url(url):
             kwargs["path"] = unquote(url.path)
         kwargs["connection_class"] = UnixDomainSocketConnection
 
-    elif url.scheme in ("redis", "rediss"):
+    else:  # implied:  url.scheme in ("redis", "rediss"):
         if url.hostname:
             kwargs["host"] = unquote(url.hostname)
         if url.port:
@@ -1208,11 +1218,6 @@ def parse_url(url):
 
         if url.scheme == "rediss":
             kwargs["connection_class"] = SSLConnection
-    else:
-        raise ValueError(
-            "Redis URL must specify one of the following "
-            "schemes (redis://, rediss://, unix://)"
-        )
 
     return kwargs
 
diff --git a/tests/test_connection_pool.py b/tests/test_connection_pool.py
index a836f5b2c7..636b04efad 100644
--- a/tests/test_connection_pool.py
+++ b/tests/test_connection_pool.py
@@ -339,6 +339,14 @@ def test_invalid_scheme_raises_error(self):
             "(redis://, rediss://, unix://)"
         )
 
+    def test_invalid_scheme_raises_error_when_double_slash_missing(self):
+        with pytest.raises(ValueError) as cm:
+            redis.ConnectionPool.from_url("redis:foo.bar.com:12345")
+        assert str(cm.value) == (
+            "Redis URL must specify one of the following schemes "
+            "(redis://, rediss://, unix://)"
+        )
+
 
 class TestConnectionPoolUnixSocketURLParsing:
     def test_defaults(self):