diff --git a/src/core/lib/event_engine/posix_engine/posix_system_api.cc b/src/core/lib/event_engine/posix_engine/posix_system_api.cc
index 9db8bc5a76edb..87dd74723f823 100644
--- a/src/core/lib/event_engine/posix_engine/posix_system_api.cc
+++ b/src/core/lib/event_engine/posix_engine/posix_system_api.cc
@@ -20,19 +20,6 @@
 
 #ifdef GRPC_POSIX_SOCKET
 #include <fcntl.h>
-#endif  //  GRPC_POSIX_SOCKET
-
-#ifdef GRPC_HAVE_UNIX_SOCKET
-#ifdef GPR_WINDOWS
-// clang-format off
-#include <ws2def.h>
-#include <afunix.h>
-// clang-format on
-#else
-#include <sys/stat.h>  // IWYU pragma: keep
-#include <sys/un.h>
-#endif  // GPR_WINDOWS
-#endif
 
 namespace grpc_event_engine {
 namespace experimental {
@@ -54,9 +41,7 @@ int PosixSystemApi::Bind(FileDescriptor fd, const struct sockaddr* addr,
 void PosixSystemApi::Close(FileDescriptor fd) const { close(fd.fd()); }
 
 int PosixSystemApi::Fcntl(FileDescriptor fd, int op, int args) const {
-#ifdef GRPC_POSIX_SOCKET
   return fcntl(fd.fd(), op, args);
-#endif
 }
 
 int PosixSystemApi::GetSockOpt(FileDescriptor fd, int level, int optname,
@@ -94,4 +79,70 @@ int PosixSystemApi::SetSockOpt(FileDescriptor fd, int level, int optname,
 }
 
 }  // namespace experimental
-}  // namespace grpc_event_engine
\ No newline at end of file
+}  // namespace grpc_event_engine
+
+#else  //  GRPC_POSIX_SOCKET
+
+namespace grpc_event_engine {
+namespace experimental {
+
+FileDescriptor PosixSystemApi::AdoptExternalFd(int fd) const {
+  grpc_core::Crash("unimplemented");
+}
+
+FileDescriptor PosixSystemApi::Socket(int domain, int type,
+                                      int protocol) const {
+  grpc_core::Crash("unimplemented");
+}
+
+int PosixSystemApi::Bind(FileDescriptor fd, const struct sockaddr* addr,
+                         socklen_t addrlen) const {
+  grpc_core::Crash("unimplemented");
+}
+
+void PosixSystemApi::Close(FileDescriptor fd) const {
+  grpc_core::Crash("unimplemented");
+}
+
+int PosixSystemApi::Fcntl(FileDescriptor fd, int op, int args) const {
+  grpc_core::Crash("unimplemented");
+}
+
+int PosixSystemApi::GetSockOpt(FileDescriptor fd, int level, int optname,
+                               void* optval, socklen_t* optlen) const {
+  grpc_core::Crash("unimplemented");
+}
+
+int PosixSystemApi::GetSockName(FileDescriptor fd, struct sockaddr* addr,
+                                socklen_t* addrlen) const {
+  grpc_core::Crash("unimplemented");
+}
+
+int PosixSystemApi::GetPeerName(FileDescriptor fd, struct sockaddr* addr,
+                                socklen_t* addrlen) const {
+  grpc_core::Crash("unimplemented");
+}
+
+int PosixSystemApi::Listen(FileDescriptor fd, int backlog) const {
+  grpc_core::Crash("unimplemented");
+}
+
+long PosixSystemApi::RecvMsg(FileDescriptor fd, struct msghdr* msg,
+                             int flags) const {
+  grpc_core::Crash("unimplemented");
+}
+
+long PosixSystemApi::SendMsg(FileDescriptor fd, const struct msghdr* message,
+                             int flags) const {
+  grpc_core::Crash("unimplemented");
+}
+
+int PosixSystemApi::SetSockOpt(FileDescriptor fd, int level, int optname,
+                               const void* optval, socklen_t optlen) const {
+  grpc_core::Crash("unimplemented");
+}
+
+}  // namespace experimental
+}  // namespace grpc_event_engine
+
+#endif  //  GRPC_POSIX_SOCKET