diff --git a/src/core/libraries/kernel/file_system.cpp b/src/core/libraries/kernel/file_system.cpp
index 6fe57406..f0ab1713 100644
--- a/src/core/libraries/kernel/file_system.cpp
+++ b/src/core/libraries/kernel/file_system.cpp
@@ -9,6 +9,7 @@
 #include "core/libraries/error_codes.h"
 #include "core/libraries/kernel/file_system.h"
 #include "core/libraries/libs.h"
+#include "libkernel.h"
 
 namespace Libraries::Kernel {
 
@@ -101,6 +102,7 @@ int PS4_SYSV_ABI posix_open(const char* path, int flags, /* SceKernelMode*/ u16
     int result = sceKernelOpen(path, flags, mode);
     // Posix calls different only for their return values
     if (result < 0) {
+        err_sce_to_posix(result);
         return -1;
     }
     return result;
@@ -125,7 +127,13 @@ int PS4_SYSV_ABI sceKernelClose(int d) {
 }
 
 int PS4_SYSV_ABI posix_close(int d) {
-    ASSERT(sceKernelClose(d) == 0);
+    int result = sceKernelClose(d);
+    if (result < 0) {
+        LOG_ERROR(Kernel_Pthread, "posix_close: error = {}", result);
+        err_sce_to_posix(result);
+        return -1;
+    }
+    return result;
     return ORBIS_OK;
 }
 
@@ -178,7 +186,13 @@ s64 PS4_SYSV_ABI sceKernelLseek(int d, s64 offset, int whence) {
 }
 
 s64 PS4_SYSV_ABI posix_lseek(int d, s64 offset, int whence) {
-    return sceKernelLseek(d, offset, whence);
+    int result = sceKernelLseek(d, offset, whence);
+    if (result < 0) {
+        LOG_ERROR(Kernel_Pthread, "posix_lseek: error = {}", result);
+        err_sce_to_posix(result);
+        return -1;
+    }
+    return result;
 }
 
 s64 PS4_SYSV_ABI sceKernelRead(int d, void* buf, size_t nbytes) {
@@ -193,7 +207,13 @@ s64 PS4_SYSV_ABI sceKernelRead(int d, void* buf, size_t nbytes) {
 }
 
 int PS4_SYSV_ABI posix_read(int d, void* buf, size_t nbytes) {
-    return sceKernelRead(d, buf, nbytes);
+    int result = sceKernelRead(d, buf, nbytes);
+    if (result < 0) {
+        LOG_ERROR(Kernel_Pthread, "posix_read: error = {}", result);
+        err_sce_to_posix(result);
+        return -1;
+    }
+    return result;
 }
 
 int PS4_SYSV_ABI sceKernelMkdir(const char* path, u16 mode) {
@@ -218,7 +238,13 @@ int PS4_SYSV_ABI sceKernelMkdir(const char* path, u16 mode) {
 }
 
 int PS4_SYSV_ABI posix_mkdir(const char* path, u16 mode) {
-    return sceKernelMkdir(path, mode);
+    int result = sceKernelMkdir(path, mode);
+    if (result < 0) {
+        LOG_ERROR(Kernel_Pthread, "posix_mkdir: error = {}", result);
+        err_sce_to_posix(result);
+        return -1;
+    }
+    return result;
 }
 
 int PS4_SYSV_ABI sceKernelStat(const char* path, OrbisKernelStat* sb) {
@@ -249,9 +275,10 @@ int PS4_SYSV_ABI sceKernelStat(const char* path, OrbisKernelStat* sb) {
 
 int PS4_SYSV_ABI posix_stat(const char* path, OrbisKernelStat* sb) {
     int result = sceKernelStat(path, sb);
-    if (result != 0) {
+    if (result < 0) {
         LOG_ERROR(Kernel_Pthread, "posix_stat: error = {}", result);
-        result += ORBIS_KERNEL_ERROR_UNKNOWN;
+        err_sce_to_posix(result);
+        return -1;
     }
     return result;
 }
@@ -311,7 +338,13 @@ int PS4_SYSV_ABI sceKernelFStat(int fd, OrbisKernelStat* sb) {
 }
 
 int PS4_SYSV_ABI posix_fstat(int fd, OrbisKernelStat* sb) {
-    return sceKernelFStat(fd, sb);
+    int result = sceKernelFStat(fd, sb);
+    if (result < 0) {
+        LOG_ERROR(Kernel_Pthread, "posix_fstat: error = {}", result);
+        err_sce_to_posix(result);
+        return -1;
+    }
+    return result;
 }
 
 s32 PS4_SYSV_ABI sceKernelFsync(int fd) {
diff --git a/src/core/libraries/kernel/libkernel.cpp b/src/core/libraries/kernel/libkernel.cpp
index e7e7d11d..f2faf049 100644
--- a/src/core/libraries/kernel/libkernel.cpp
+++ b/src/core/libraries/kernel/libkernel.cpp
@@ -63,9 +63,16 @@ size_t PS4_SYSV_ABI _writev(int fd, const struct iovec* iov, int iovcn) {
     return total_written;
 }
 
-static thread_local int libc_error{};
+static thread_local int g_posix_errno = 0;
 int* PS4_SYSV_ABI __Error() {
-    return &libc_error;
+    return &g_posix_errno;
+}
+
+void err_sce_to_posix(int result) {
+    int rt = result > SCE_KERNEL_ERROR_UNKNOWN && result <= SCE_KERNEL_ERROR_ESTOP
+                 ? result + -SCE_KERNEL_ERROR_UNKNOWN
+                 : POSIX_EOTHER;
+    g_posix_errno = rt;
 }
 
 int PS4_SYSV_ABI sceKernelMmap(void* addr, u64 len, int prot, int flags, int fd, size_t offset,
diff --git a/src/core/libraries/kernel/libkernel.h b/src/core/libraries/kernel/libkernel.h
index 0cc6b0b2..07413888 100644
--- a/src/core/libraries/kernel/libkernel.h
+++ b/src/core/libraries/kernel/libkernel.h
@@ -12,6 +12,8 @@ class SymbolsResolver;
 
 namespace Libraries::Kernel {
 
+void err_sce_to_posix(int result);
+
 struct OrbisTimesec {
     time_t t;
     u32 west_sec;