diff --git a/Network/Socket/Info.hsc b/Network/Socket/Info.hsc
index 0a874a92..72e1803a 100644
--- a/Network/Socket/Info.hsc
+++ b/Network/Socket/Info.hsc
@@ -413,11 +413,7 @@ unpackBits ((k,v):xs) r
 -- SockAddr
 
 instance Show SockAddr where
-#if defined(DOMAIN_SOCKET_SUPPORT)
   showsPrec _ (SockAddrUnix str) = showString str
-#else
-  showsPrec _ SockAddrUnix{} = error "showsPrec: not supported"
-#endif
   showsPrec _ (SockAddrInet port ha)
    = showHostAddress ha
    . showString ":"
diff --git a/Network/Socket/Types.hsc b/Network/Socket/Types.hsc
index 99717129..86135ba4 100644
--- a/Network/Socket/Types.hsc
+++ b/Network/Socket/Types.hsc
@@ -93,9 +93,7 @@ import GHC.IO (IO (..))
 
 import qualified Text.Read as P
 
-#if defined(DOMAIN_SOCKET_SUPPORT)
 import Foreign.Marshal.Array
-#endif
 
 import Network.Socket.Imports
 
@@ -1075,11 +1073,7 @@ isSupportedSockAddr :: SockAddr -> Bool
 isSupportedSockAddr addr = case addr of
   SockAddrInet{}  -> True
   SockAddrInet6{} -> True
-#if defined(DOMAIN_SOCKET_SUPPORT)
   SockAddrUnix{}  -> True
-#else
-  SockAddrUnix{}  -> False
-#endif
 
 instance SocketAddress SockAddr where
     sizeOfSocketAddress = sizeOfSockAddr
@@ -1098,7 +1092,6 @@ type CSaFamily = (#type sa_family_t)
 -- 'SockAddr'.  This function differs from 'Foreign.Storable.sizeOf'
 -- in that the value of the argument /is/ used.
 sizeOfSockAddr :: SockAddr -> Int
-#if defined(DOMAIN_SOCKET_SUPPORT)
 # ifdef linux_HOST_OS
 -- http://man7.org/linux/man-pages/man7/unix.7.html says:
 -- "an abstract socket address is distinguished (from a
@@ -1118,9 +1111,6 @@ sizeOfSockAddr (SockAddrUnix path) =
 # else
 sizeOfSockAddr SockAddrUnix{}  = #const sizeof(struct sockaddr_un)
 # endif
-#else
-sizeOfSockAddr SockAddrUnix{}  = error "sizeOfSockAddr: not supported"
-#endif
 sizeOfSockAddr SockAddrInet{}  = #const sizeof(struct sockaddr_in)
 sizeOfSockAddr SockAddrInet6{} = #const sizeof(struct sockaddr_in6)
 
@@ -1135,10 +1125,8 @@ withSockAddr addr f = do
 -- structure, and attempting to do so could overflow the allocated storage
 -- space.  This constant holds the maximum allowable path length.
 --
-#if defined(DOMAIN_SOCKET_SUPPORT)
 unixPathMax :: Int
 unixPathMax = #const sizeof(((struct sockaddr_un *)NULL)->sun_path)
-#endif
 
 -- We can't write an instance of 'Storable' for 'SockAddr' because
 -- @sockaddr@ is a sum type of variable size but
@@ -1149,7 +1137,6 @@ unixPathMax = #const sizeof(((struct sockaddr_un *)NULL)->sun_path)
 
 -- | Write the given 'SockAddr' to the given memory location.
 pokeSockAddr :: Ptr a -> SockAddr -> IO ()
-#if defined(DOMAIN_SOCKET_SUPPORT)
 pokeSockAddr p sa@(SockAddrUnix path) = do
     when (length path > unixPathMax) $ error
       $ "pokeSockAddr: path is too long in SockAddrUnix " <> show path
@@ -1162,9 +1149,6 @@ pokeSockAddr p sa@(SockAddrUnix path) = do
     let pathC = map castCharToCChar path
     -- the buffer is already filled with nulls.
     pokeArray ((#ptr struct sockaddr_un, sun_path) p) pathC
-#else
-pokeSockAddr _ SockAddrUnix{} = error "pokeSockAddr: not supported"
-#endif
 pokeSockAddr p (SockAddrInet port addr) = do
     zeroMemory p (#const sizeof(struct sockaddr_in))
 #if defined(HAVE_STRUCT_SOCKADDR_SA_LEN)
@@ -1189,11 +1173,9 @@ peekSockAddr :: Ptr SockAddr -> IO SockAddr
 peekSockAddr p = do
   family <- (#peek struct sockaddr, sa_family) p
   case family :: CSaFamily of
-#if defined(DOMAIN_SOCKET_SUPPORT)
     (#const AF_UNIX) -> do
         str <- peekCAString ((#ptr struct sockaddr_un, sun_path) p)
         return (SockAddrUnix str)
-#endif
     (#const AF_INET) -> do
         addr <- (#peek struct sockaddr_in, sin_addr) p
         port <- (#peek struct sockaddr_in, sin_port) p
diff --git a/Network/Socket/Unix.hsc b/Network/Socket/Unix.hsc
index ae20d8d2..cd9a714f 100644
--- a/Network/Socket/Unix.hsc
+++ b/Network/Socket/Unix.hsc
@@ -30,13 +30,11 @@ import System.IO.Error (catchIOError)
 #ifdef HAVE_GETPEEREID
 import Foreign.Marshal.Alloc (alloca)
 #endif
-#ifdef DOMAIN_SOCKET_SUPPORT
 import Foreign.Marshal.Alloc (allocaBytes)
 import Foreign.Marshal.Array (peekArray)
 
 import Network.Socket.Fcntl
 import Network.Socket.Internal
-#endif
 #ifdef HAVE_STRUCT_UCRED_SO_PEERCRED
 import Network.Socket.Options
 #endif
@@ -126,11 +124,7 @@ getPeerEid _ = return (0, 0)
 --
 --   Since 2.7.0.0.
 isUnixDomainSocketAvailable :: Bool
-#if defined(DOMAIN_SOCKET_SUPPORT)
 isUnixDomainSocketAvailable = True
-#else
-isUnixDomainSocketAvailable = False
-#endif
 
 data NullSockAddr = NullSockAddr
 
@@ -143,15 +137,11 @@ instance SocketAddress NullSockAddr where
 --   Use this function in the case where 'isUnixDomainSocketAvailable' is
 --  'True'.
 sendFd :: Socket -> CInt -> IO ()
-#if defined(DOMAIN_SOCKET_SUPPORT)
 sendFd s outfd = void $ allocaBytes dummyBufSize $ \buf -> do
     let cmsg = encodeCmsg $ Fd outfd
     sendBufMsg s NullSockAddr [(buf,dummyBufSize)] [cmsg] mempty
   where
     dummyBufSize = 1
-#else
-sendFd _ _ = error "Network.Socket.sendFd"
-#endif
 
 -- | Receive a file descriptor over a UNIX-domain socket. Note that the resulting
 --   file descriptor may have to be put into non-blocking mode in order to be
@@ -159,7 +149,6 @@ sendFd _ _ = error "Network.Socket.sendFd"
 --   Use this function in the case where 'isUnixDomainSocketAvailable' is
 --  'True'.
 recvFd :: Socket -> IO CInt
-#if defined(DOMAIN_SOCKET_SUPPORT)
 recvFd s = allocaBytes dummyBufSize $ \buf -> do
     (NullSockAddr, _, cmsgs, _) <- recvBufMsg s [(buf,dummyBufSize)] 32 mempty
     case (lookupCmsg CmsgIdFd cmsgs >>= decodeCmsg) :: Maybe Fd of
@@ -167,9 +156,6 @@ recvFd s = allocaBytes dummyBufSize $ \buf -> do
       Just (Fd fd) -> return fd
   where
     dummyBufSize = 16
-#else
-recvFd _ = error "Network.Socket.recvFd"
-#endif
 
 -- | Build a pair of connected socket objects.
 --   For portability, use this function in the case
@@ -179,7 +165,6 @@ socketPair :: Family              -- Family Name (usually AF_UNIX)
            -> SocketType          -- Socket Type (usually Stream)
            -> ProtocolNumber      -- Protocol Number
            -> IO (Socket, Socket) -- unnamed and connected.
-#if defined(DOMAIN_SOCKET_SUPPORT)
 socketPair family stype protocol =
     allocaBytes (2 * sizeOf (1 :: CInt)) $ \ fdArr -> do
       let c_stype = packSocketType stype
@@ -194,6 +179,3 @@ socketPair family stype protocol =
 
 foreign import ccall unsafe "socketpair"
   c_socketpair :: CInt -> CInt -> CInt -> Ptr CInt -> IO CInt
-#else
-socketPair _ _ _ = error "Network.Socket.socketPair"
-#endif
diff --git a/include/HsNetDef.h b/include/HsNetDef.h
index b3b7ac90..d84640de 100644
--- a/include/HsNetDef.h
+++ b/include/HsNetDef.h
@@ -10,8 +10,6 @@
 #undef PACKAGE_TARNAME
 #undef PACKAGE_VERSION
 
-#define DOMAIN_SOCKET_SUPPORT 1
-
 #if defined(HAVE_STRUCT_UCRED) && HAVE_DECL_SO_PEERCRED
 # define HAVE_STRUCT_UCRED_SO_PEERCRED 1
 #else