diff --git a/Userland/Libraries/LibCore/LocalServer.cpp b/Userland/Libraries/LibCore/LocalServer.cpp
index 9e8caee223..6051526213 100644
--- a/Userland/Libraries/LibCore/LocalServer.cpp
+++ b/Userland/Libraries/LibCore/LocalServer.cpp
@@ -118,7 +118,7 @@ ErrorOr<NonnullOwnPtr<LocalSocket>> LocalServer::accept()
     VERIFY(m_listening);
     sockaddr_un un;
     socklen_t un_size = sizeof(un);
-#ifndef AK_OS_MACOS
+#if !defined(AK_OS_MACOS) && !defined(AK_OS_HAIKU)
     int accepted_fd = ::accept4(m_fd, (sockaddr*)&un, &un_size, SOCK_NONBLOCK | SOCK_CLOEXEC);
 #else
     int accepted_fd = ::accept(m_fd, (sockaddr*)&un, &un_size);
@@ -127,7 +127,7 @@ ErrorOr<NonnullOwnPtr<LocalSocket>> LocalServer::accept()
         return Error::from_syscall("accept"sv, -errno);
     }
 
-#ifdef AK_OS_MACOS
+#if defined(AK_OS_MACOS) || defined(AK_OS_HAIKU)
     int option = 1;
     ioctl(m_fd, FIONBIO, &option);
     (void)fcntl(accepted_fd, F_SETFD, FD_CLOEXEC);
diff --git a/Userland/Libraries/LibCore/System.cpp b/Userland/Libraries/LibCore/System.cpp
index 6b3e50eb95..e1a46eda49 100644
--- a/Userland/Libraries/LibCore/System.cpp
+++ b/Userland/Libraries/LibCore/System.cpp
@@ -380,7 +380,7 @@ ErrorOr<Optional<struct spwd>> getspnam(StringView name)
 }
 #endif
 
-#ifndef AK_OS_MACOS
+#if !defined(AK_OS_MACOS) && !defined(AK_OS_HAIKU)
 ErrorOr<int> accept4(int sockfd, sockaddr* address, socklen_t* address_length, int flags)
 {
     auto fd = ::accept4(sockfd, address, address_length, flags);
diff --git a/Userland/Libraries/LibCore/System.h b/Userland/Libraries/LibCore/System.h
index 7e987e0bd8..9baf178154 100644
--- a/Userland/Libraries/LibCore/System.h
+++ b/Userland/Libraries/LibCore/System.h
@@ -105,7 +105,7 @@ ErrorOr<Optional<struct spwd>> getspent();
 ErrorOr<Optional<struct spwd>> getspnam(StringView name);
 #endif
 
-#ifndef AK_OS_MACOS
+#if !defined(AK_OS_MACOS) && !defined(AK_OS_HAIKU)
 ErrorOr<int> accept4(int sockfd, struct sockaddr*, socklen_t*, int flags);
 #endif
 
diff --git a/Userland/Libraries/LibCore/TCPServer.cpp b/Userland/Libraries/LibCore/TCPServer.cpp
index 421dcb6897..4835a61fa7 100644
--- a/Userland/Libraries/LibCore/TCPServer.cpp
+++ b/Userland/Libraries/LibCore/TCPServer.cpp
@@ -80,7 +80,7 @@ ErrorOr<NonnullOwnPtr<TCPSocket>> TCPServer::accept()
     VERIFY(m_listening);
     sockaddr_in in;
     socklen_t in_size = sizeof(in);
-#ifndef AK_OS_MACOS
+#if !defined(AK_OS_MACOS) && !defined(AK_OS_HAIKU)
     int accepted_fd = TRY(Core::System::accept4(m_fd, (sockaddr*)&in, &in_size, SOCK_NONBLOCK | SOCK_CLOEXEC));
 #else
     int accepted_fd = TRY(Core::System::accept(m_fd, (sockaddr*)&in, &in_size));
@@ -88,7 +88,7 @@ ErrorOr<NonnullOwnPtr<TCPSocket>> TCPServer::accept()
 
     auto socket = TRY(TCPSocket::adopt_fd(accepted_fd));
 
-#ifdef AK_OS_MACOS
+#if defined(AK_OS_MACOS) || defined(AK_OS_HAIKU)
     // FIXME: Ideally, we should let the caller decide whether it wants the
     //        socket to be nonblocking or not, but there are currently places
     //        which depend on this.