diff --git a/http-client/Network/HTTP/Client.hs b/http-client/Network/HTTP/Client.hs
index 4182ee58..d5cd9fe9 100644
--- a/http-client/Network/HTTP/Client.hs
+++ b/http-client/Network/HTTP/Client.hs
@@ -323,12 +323,12 @@ managerSetProxy :: ProxyOverride -> ManagerSettings -> ManagerSettings
 managerSetProxy po = managerSetInsecureProxy po . managerSetSecureProxy po
 
 -- @since 0.7.17
-managerSetMaxHeaderLength :: Word -> ManagerSettings -> ManagerSettings
+managerSetMaxHeaderLength :: Int -> ManagerSettings -> ManagerSettings
 managerSetMaxHeaderLength l manager = manager
     { managerMaxHeaderLength = MaxHeaderLength l }
 
 -- @since 0.7.18
-managerSetMaxNumberHeaders :: Word -> ManagerSettings -> ManagerSettings
+managerSetMaxNumberHeaders :: Int -> ManagerSettings -> ManagerSettings
 managerSetMaxNumberHeaders n manager = manager
     { managerMaxNumberHeaders = MaxNumberHeaders n }
 
diff --git a/http-client/Network/HTTP/Client/Connection.hs b/http-client/Network/HTTP/Client/Connection.hs
index 673b0d61..26db9638 100644
--- a/http-client/Network/HTTP/Client/Connection.hs
+++ b/http-client/Network/HTTP/Client/Connection.hs
@@ -50,7 +50,7 @@ connectionReadLineWith mhl conn bs0 =
     go bs front total =
         case S.break (== charLF) bs of
             (_, "") -> do
-                let total' = total + fromIntegral (S.length bs)
+                let total' = total + S.length bs
                 when (total > unMaxHeaderLength mhl) $ do
                     -- We reached the maximum length for an header field.
                     throwHttp OverlongHeaders
diff --git a/http-client/Network/HTTP/Client/Headers.hs b/http-client/Network/HTTP/Client/Headers.hs
index 7b585838..d1ba2bfe 100644
--- a/http-client/Network/HTTP/Client/Headers.hs
+++ b/http-client/Network/HTTP/Client/Headers.hs
@@ -91,13 +91,13 @@ parseStatusHeaders mhl mnh conn timeout' onEarlyHintHeaders cont
             Just (i, "") -> Just i
             _ -> Nothing
 
-    guardMaxNumberHeaders :: Word -> IO ()
+    guardMaxNumberHeaders :: Int -> IO ()
     guardMaxNumberHeaders count =
         when (count >= unMaxNumberHeaders mnh) $ do
             -- We reached the maximum number of header fields.
             throwHttp TooManyHeaders
 
-    parseHeaders :: Word -> ([Header] -> [Header]) -> IO [Header]
+    parseHeaders :: Int -> ([Header] -> [Header]) -> IO [Header]
     parseHeaders count front = do
         guardMaxNumberHeaders count
         line <- connectionReadLine mhl conn
@@ -112,7 +112,7 @@ parseStatusHeaders mhl mnh conn timeout' onEarlyHintHeaders cont
                         -- an exception, ignore it for robustness.
                         parseHeaders count front
 
-    parseEarlyHintHeadersUntilFailure :: Word -> ([Header] -> [Header]) -> IO [Header]
+    parseEarlyHintHeadersUntilFailure :: Int -> ([Header] -> [Header]) -> IO [Header]
     parseEarlyHintHeadersUntilFailure count front = do
         guardMaxNumberHeaders count
         line <- connectionReadLine mhl conn
diff --git a/http-client/Network/HTTP/Client/Types.hs b/http-client/Network/HTTP/Client/Types.hs
index 8473bf9e..3fb1d020 100644
--- a/http-client/Network/HTTP/Client/Types.hs
+++ b/http-client/Network/HTTP/Client/Types.hs
@@ -922,7 +922,7 @@ data StreamFileStatus = StreamFileStatus
 --
 -- @since 0.7.14
 newtype MaxHeaderLength = MaxHeaderLength
-    { unMaxHeaderLength :: Word
+    { unMaxHeaderLength :: Int
     }
     deriving (Eq, Show, Ord, Num, Enum, Bounded, T.Typeable)
 
@@ -933,7 +933,7 @@ noMaxHeaderLength = maxBound
 --
 -- @since 0.7.18
 newtype MaxNumberHeaders = MaxNumberHeaders
-    { unMaxNumberHeaders :: Word
+    { unMaxNumberHeaders :: Int
     }
     deriving (Eq, Show, Ord, Num, Enum, Bounded, T.Typeable)