diff --git a/core/libs/prx/libkernel/File/src/Stdio.cpp b/core/libs/prx/libkernel/File/src/Stdio.cpp
index dbb451f04..0a1cb021d 100644
--- a/core/libs/prx/libkernel/File/src/Stdio.cpp
+++ b/core/libs/prx/libkernel/File/src/Stdio.cpp
@@ -472,8 +472,6 @@ int File::DuplicateFrom(int fd, int start) {
 #else
     const int duplicate = ::fcntl(fd, F_DUPFD, start);
     if (duplicate < 0) return PosixFailure(SceErrorFromErrno(errno) & 0xffff);
-    if (duplicate >= GuestSockets::FirstDescriptor)
-        throw std::runtime_error("fcntl: host descriptor reached the guest socket range");
     if (File::IsRandomDevice(fd)) File::RememberRandomDevice(duplicate);
     File::ShareDescriptor(fd, duplicate);
     return duplicate;
diff --git a/core/libs/prx/libkernel/Socket/src/Udp.cpp b/core/libs/prx/libkernel/Socket/src/Udp.cpp
index dad367314..a1ef0378c 100644
--- a/core/libs/prx/libkernel/Socket/src/Udp.cpp
+++ b/core/libs/prx/libkernel/Socket/src/Udp.cpp
@@ -670,7 +670,7 @@ int GuestSockets::Poll(KernelSocketPoll::Entry* entries, int count, int timeoutM
 
 extern "C" {
 int APS5_VABI fcntl_nid_postfix(int descriptor, int command, ...) {
-    if (descriptor < GuestSockets::FirstDescriptor) {
+    if (!GuestSockets::IsOpen(descriptor)) {
         const auto type = File::FcntlArgumentOf(command);
         std::intptr_t argument = 0;
         if (type != File::FcntlArgument::None) {
@@ -917,7 +917,7 @@ int APS5_VABI getpeername_nid_postfix(int descriptor, void* address, std::uint32
     return 0;
 }
 int APS5_VABI ioctl_nid_postfix(int descriptor, std::uint64_t request, void* argument) {
-    if (descriptor < GuestSockets::FirstDescriptor) return File::Ioctl(descriptor, request, argument);
+    if (!GuestSockets::IsOpen(descriptor)) return File::Ioctl(descriptor, request, argument);
     const auto socket = Lookup(descriptor);
     if (!socket) return -1;
     if (!argument) return Fail(14);