diff --git a/core/libs/prx/libSceSysmodule/CMakeLists.txt b/core/libs/prx/libSceSysmodule/CMakeLists.txt
new file mode 100644
index 000000000..afbcf4cd6
--- /dev/null
+++ b/core/libs/prx/libSceSysmodule/CMakeLists.txt
@@ -0,0 +1,20 @@
+add_library(libSceSysmodule SHARED EXCLUDE_FROM_ALL Export.cpp)
+target_include_directories(libSceSysmodule PRIVATE ${LIBS_INCLUDE_DIR})
+configure_windows_unwind(libSceSysmodule)
+
+if(MINGW)
+    foreach(runtimeLinkFlag IN ITEMS -static-libgcc -static-libstdc++ -static)
+        string(REPLACE "${runtimeLinkFlag}" "" CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
+    endforeach()
+endif()
+
+if(BUILD_TESTING)
+    add_test_executable(guest_sysmodule_tests ${LIBS_INCLUDE_DIR}/tests/GuestSysmodule.cpp)
+    target_include_directories(guest_sysmodule_tests PRIVATE ${LIBS_INCLUDE_DIR})
+    target_link_libraries(guest_sysmodule_tests PRIVATE libSceSysmodule)
+    add_test(NAME guest_sysmodule COMMAND guest_sysmodule_tests)
+    if(WIN32)
+        set_tests_properties(guest_sysmodule PROPERTIES ENVIRONMENT_MODIFICATION
+            "PATH=path_list_prepend:$<TARGET_FILE_DIR:libSceSysmodule>")
+    endif()
+endif()
diff --git a/core/libs/prx/libSceSysmodule/Export.cpp b/core/libs/prx/libSceSysmodule/Export.cpp
index 76f993459..85b64a2ed 100644
--- a/core/libs/prx/libSceSysmodule/Export.cpp
+++ b/core/libs/prx/libSceSysmodule/Export.cpp
@@ -166,4 +166,32 @@ int APS5_VABI sceSysmoduleUnloadModule(std::uint16_t id) {
     return 0;
 }
 
+int APS5_VABI sceSysmoduleLoadModuleInternal(std::uint32_t id) {
+    if ((id & 0x7fffffffu) == 0) {
+        throw std::runtime_error("sceSysmoduleLoadModuleInternal: invalid id 0");
+    }
+    if (!findModuleName(id)) {
+        throw std::runtime_error(std::string("sceSysmoduleLoadModuleInternal: unknown id ") + std::to_string(id));
+    }
+    std::lock_guard<std::mutex> lock(gMutex);
+    gLoadCount[id]++;
+    return 0;
+}
+
+int APS5_VABI sceSysmoduleUnloadModuleInternal(std::uint32_t id) {
+    if ((id & 0x7fffffffu) == 0) {
+        throw std::runtime_error("sceSysmoduleUnloadModuleInternal: invalid id 0");
+    }
+    if (!findModuleName(id)) {
+        throw std::runtime_error(std::string("sceSysmoduleUnloadModuleInternal: unknown id ") + std::to_string(id));
+    }
+    std::lock_guard<std::mutex> lock(gMutex);
+    auto it = gLoadCount.find(id);
+    if (it == gLoadCount.end() || it->second < 1) {
+        return 0x80A90003;
+    }
+    it->second--;
+    return 0;
+}
+
 }
diff --git a/core/libs/tests/GuestSysmodule.cpp b/core/libs/tests/GuestSysmodule.cpp
new file mode 100644
index 000000000..bf6dbaa00
--- /dev/null
+++ b/core/libs/tests/GuestSysmodule.cpp
@@ -0,0 +1,25 @@
+#include "prx/libc/include/general/VabiMacros.hpp"
+#include <cstdint>
+#include <cstdlib>
+
+extern "C" {
+int APS5_VABI sceSysmoduleLoadModuleInternal(std::uint32_t id);
+int APS5_VABI sceSysmoduleUnloadModuleInternal(std::uint32_t id);
+}
+
+namespace {
+
+void Require(bool value) { if (!value) std::abort(); }
+
+constexpr std::uint32_t kFiberModuleId = 0x00000006;
+constexpr int kModuleNotLoaded = static_cast<int>(0x80A90003);
+
+}
+
+int main() {
+    Require(sceSysmoduleLoadModuleInternal(kFiberModuleId) == 0);
+    Require(sceSysmoduleLoadModuleInternal(kFiberModuleId) == 0);
+    Require(sceSysmoduleUnloadModuleInternal(kFiberModuleId) == 0);
+    Require(sceSysmoduleUnloadModuleInternal(kFiberModuleId) == 0);
+    Require(sceSysmoduleUnloadModuleInternal(kFiberModuleId) == kModuleNotLoaded);
+}