diff --git a/core/libs/prx/libkernel/File/src/Stdio.cpp b/core/libs/prx/libkernel/File/src/Stdio.cpp
index 4d786eb038..4c9931e4a9 100644
--- a/core/libs/prx/libkernel/File/src/Stdio.cpp
+++ b/core/libs/prx/libkernel/File/src/Stdio.cpp
@@ -887,6 +887,7 @@ int APS5_VABI sceKernelFtruncate(int d, int64_t length) {
 }
 
 int64_t APS5_VABI lseek_nid_postfix(int d, int64_t offset, int whence) {
+    if (!GuestSockets::IsOpen(d) && !DescriptorIsOpen_nid_no_patch(d)) return PosixFailure(GUEST_EBADF);
     if (whence < 0 || whence > 2) return PosixFailure(GUEST_EINVAL);
     return PosixResult(sceKernelLseek(d, offset, whence));
 }
diff --git a/core/libs/tests/GuestFilesystem.cpp b/core/libs/tests/GuestFilesystem.cpp
index 7818a4421c..e445f5a603 100644
--- a/core/libs/tests/GuestFilesystem.cpp
+++ b/core/libs/tests/GuestFilesystem.cpp
@@ -1026,6 +1026,9 @@ int main() {
     Require(flock_nid_postfix(other, 2 | 4) == 0);
     Require(flock_nid_postfix(other, 8) == 0);
     Require(flock_nid_postfix(locked, 2 | 4) == 0);
+    Require(lseek_nid_postfix(-1, 0, 7) == -1 && *__error_nid_postfix() == 9);
+    Require(lseek_nid_postfix(0x7fffffff, 0, -1) == -1 && *__error_nid_postfix() == 9);
+    Require(lseek_nid_postfix(locked, 0, 7) == -1 && *__error_nid_postfix() == 22);
     Require(flock_nid_postfix(-1, 2 | 4) == -1 && *__error_nid_postfix() == 9);
     Require(flock_nid_postfix(0x7fffffff, 1) == -1 && *__error_nid_postfix() == 9);
     int flockPipe[2] = {-1, -1};