diff --git a/core/libs/prx/libSceLibcInternal/CMakeLists.txt b/core/libs/prx/libSceLibcInternal/CMakeLists.txt
index da7eb464b..a0aae315f 100644
--- a/core/libs/prx/libSceLibcInternal/CMakeLists.txt
+++ b/core/libs/prx/libSceLibcInternal/CMakeLists.txt
@@ -19,6 +19,16 @@ if(BUILD_TESTING)
         set_tests_properties(guest_utime PROPERTIES ENVIRONMENT_MODIFICATION
             "PATH=path_list_prepend:$<TARGET_FILE_DIR:libSceLibcInternal>")
     endif()
+    add_test_executable(guest_program_name_tests ${LIBS_INCLUDE_DIR}/tests/GuestProgramName.cpp)
+    target_include_directories(guest_program_name_tests PRIVATE ${LIBS_INCLUDE_DIR})
+    target_link_libraries(guest_program_name_tests PRIVATE libSceLibcInternal libkernel libc)
+    configure_windows_unwind(guest_program_name_tests)
+    add_test(NAME guest_program_name COMMAND guest_program_name_tests)
+    set_tests_properties(guest_program_name PROPERTIES TIMEOUT 20)
+    if(WIN32)
+        set_tests_properties(guest_program_name PROPERTIES ENVIRONMENT_MODIFICATION
+            "PATH=path_list_prepend:$<TARGET_FILE_DIR:libSceLibcInternal>")
+    endif()
     add_test_executable(guest_thread_atexit_tests ${LIBS_INCLUDE_DIR}/tests/GuestThreadAtexit.cpp)
     target_include_directories(guest_thread_atexit_tests PRIVATE ${LIBS_INCLUDE_DIR})
     target_link_libraries(guest_thread_atexit_tests PRIVATE libSceLibcInternal libkernel libc)
diff --git a/core/libs/prx/libSceLibcInternal/Export.cpp b/core/libs/prx/libSceLibcInternal/Export.cpp
index 89afdbc73..567f6271c 100644
--- a/core/libs/prx/libSceLibcInternal/Export.cpp
+++ b/core/libs/prx/libSceLibcInternal/Export.cpp
@@ -15,6 +15,7 @@
 
 extern "C" void APS5_VABI sceKernelSetThreadDtors(thread_dtors_func_t dtors);
 extern "C" int APS5_VABI sceKernelGetModuleInfoFromAddr(std::uint64_t address, int flags, ModuleInfoEx* info);
+extern "C" const char* __progname_nid_postfix;
 
 namespace {
 
@@ -104,6 +105,10 @@ extern "C" {
 
 int Need_sceLibcInternal_nid_postfix = 1;
 
+const char* APS5_VABI getprogname_nid_postfix() {
+    return __progname_nid_postfix;
+}
+
 void APS5_VABI __cxa_finalize_nid_postfix(void* dsoHandle) {
     CxaFinalize_nid_no_patch(dsoHandle);
 }
diff --git a/core/libs/tests/GuestProgramName.cpp b/core/libs/tests/GuestProgramName.cpp
new file mode 100644
index 000000000..48be372cc
--- /dev/null
+++ b/core/libs/tests/GuestProgramName.cpp
@@ -0,0 +1,32 @@
+#include "SceTypes.hpp"
+#include <cstdlib>
+#include <cstring>
+
+extern "C" {
+const char* APS5_VABI getprogname_nid_postfix();
+extern const char* __progname_nid_postfix;
+int* APS5_VABI __error_nid_postfix();
+}
+
+static void Require(bool value) { if (!value) std::abort(); }
+
+int main() {
+    const char* const original = __progname_nid_postfix;
+    *__error_nid_postfix() = 45;
+    Require(getprogname_nid_postfix() == original);
+    Require(std::strcmp(getprogname_nid_postfix(), "eboot.bin") == 0);
+    Require(*__error_nid_postfix() == 45);
+
+    char renamed[] = "quake2";
+    __progname_nid_postfix = renamed;
+    Require(getprogname_nid_postfix() == renamed);
+    renamed[0] = 'Q';
+    Require(std::strcmp(getprogname_nid_postfix(), "Quake2") == 0);
+
+    __progname_nid_postfix = "";
+    Require(getprogname_nid_postfix()[0] == '\0');
+
+    __progname_nid_postfix = original;
+    Require(getprogname_nid_postfix() == original);
+    Require(*__error_nid_postfix() == 45);
+}