diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,7 @@
+## 0.3.5.3
+
+* Fix `newTlsManager` [#325](https://github.com/snoyberg/http-client/issues/325)
+
 ## 0.3.5.2
 
 * [#289](https://github.com/snoyberg/http-client/issues/289):
diff --git a/Network/HTTP/Client/TLS.hs b/Network/HTTP/Client/TLS.hs
--- a/Network/HTTP/Client/TLS.hs
+++ b/Network/HTTP/Client/TLS.hs
@@ -180,7 +180,16 @@
 --
 -- @since 0.3.4
 newTlsManager :: MonadIO m => m Manager
-newTlsManager = newTlsManagerWith defaultManagerSettings
+newTlsManager = liftIO $ do
+    env <- getEnvironment
+    let lenv = Map.fromList $ map (first $ T.toLower . T.pack) env
+        msocksHTTP = parseSocksSettings env lenv "http_proxy"
+        msocksHTTPS = parseSocksSettings env lenv "https_proxy"
+        settings = mkManagerSettingsContext' defaultManagerSettings (Just globalConnectionContext) def msocksHTTP msocksHTTPS
+        settings' = maybe id (const $ managerSetInsecureProxy proxyFromRequest) msocksHTTP
+                  $ maybe id (const $ managerSetSecureProxy proxyFromRequest) msocksHTTPS
+                    settings
+    newManager settings'
 
 -- | Load up a new TLS manager based upon specified settings,
 -- respecting proxy environment variables.
diff --git a/http-client-tls.cabal b/http-client-tls.cabal
--- a/http-client-tls.cabal
+++ b/http-client-tls.cabal
@@ -1,5 +1,5 @@
 name:                http-client-tls
-version:             0.3.5.2
+version:             0.3.5.3
 synopsis:            http-client backend using the connection package and tls library
 description:         Hackage documentation generation is not reliable. For up to date documentation, please see: <https://www.stackage.org/package/http-client-tls>.
 homepage:            https://github.com/snoyberg/http-client
diff --git a/test/Spec.hs b/test/Spec.hs
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -44,3 +44,9 @@
         request <- parseRequest url
         response <- httpNoBody request manager
         responseStatus response `shouldBe` status200
+
+    it "global supports TLS" $ do
+        manager <- getGlobalManager
+        request <- parseRequest "https://httpbin.org"
+        response <- httpNoBody request manager
+        responseStatus response `shouldBe` status200