diff --git a/core/libs/prx/libSceSysmodule/Export.cpp b/core/libs/prx/libSceSysmodule/Export.cpp
index 85b64a2ed..83f56fb54 100644
--- a/core/libs/prx/libSceSysmodule/Export.cpp
+++ b/core/libs/prx/libSceSysmodule/Export.cpp
@@ -18,6 +18,8 @@
 
 namespace {
 
+constexpr int SCE_SYSMODULE_ERROR_UNLOADED = static_cast<int>(0x805A1001);
+
 const char* findModuleName(const std::uint32_t id) {
     const auto it = kModuleTable.find(id);
     return it != kModuleTable.end() ? it->second : nullptr;
@@ -112,7 +114,7 @@ int APS5_VABI sceSysmoduleIsLoaded(std::uint16_t id) {
     std::lock_guard<std::mutex> lock(gMutex);
     auto it = gLoadCount.find(id);
     if (it == gLoadCount.end() || it->second < 1) {
-        return 0x80A90002;
+        return SCE_SYSMODULE_ERROR_UNLOADED;
     }
     return 0;
 }
@@ -160,7 +162,7 @@ int APS5_VABI sceSysmoduleUnloadModule(std::uint16_t id) {
     std::lock_guard<std::mutex> lock(gMutex);
     auto it = gLoadCount.find(id);
     if (it == gLoadCount.end() || it->second < 1) {
-        return 0x80A90003;
+        return SCE_SYSMODULE_ERROR_UNLOADED;
     }
     it->second--;
     return 0;
@@ -188,7 +190,7 @@ int APS5_VABI sceSysmoduleUnloadModuleInternal(std::uint32_t id) {
     std::lock_guard<std::mutex> lock(gMutex);
     auto it = gLoadCount.find(id);
     if (it == gLoadCount.end() || it->second < 1) {
-        return 0x80A90003;
+        return SCE_SYSMODULE_ERROR_UNLOADED;
     }
     it->second--;
     return 0;
diff --git a/core/libs/tests/GuestSysmodule.cpp b/core/libs/tests/GuestSysmodule.cpp
index bf6dbaa00..f3ffdecb0 100644
--- a/core/libs/tests/GuestSysmodule.cpp
+++ b/core/libs/tests/GuestSysmodule.cpp
@@ -3,6 +3,9 @@
 #include <cstdlib>
 
 extern "C" {
+int APS5_VABI sceSysmoduleIsLoaded(std::uint16_t id);
+int APS5_VABI sceSysmoduleLoadModule(std::uint16_t id);
+int APS5_VABI sceSysmoduleUnloadModule(std::uint16_t id);
 int APS5_VABI sceSysmoduleLoadModuleInternal(std::uint32_t id);
 int APS5_VABI sceSysmoduleUnloadModuleInternal(std::uint32_t id);
 }
@@ -11,15 +14,27 @@ namespace {
 
 void Require(bool value) { if (!value) std::abort(); }
 
-constexpr std::uint32_t kFiberModuleId = 0x00000006;
-constexpr int kModuleNotLoaded = static_cast<int>(0x80A90003);
+constexpr std::uint16_t kFiberModuleId = 0x0006;
+constexpr std::uint16_t kUltModuleId = 0x0007;
+constexpr int kModuleUnloaded = static_cast<int>(0x805A1001);
 
 }
 
 int main() {
+    Require(sceSysmoduleIsLoaded(kFiberModuleId) == kModuleUnloaded);
     Require(sceSysmoduleLoadModuleInternal(kFiberModuleId) == 0);
+    Require(sceSysmoduleIsLoaded(kFiberModuleId) == 0);
     Require(sceSysmoduleLoadModuleInternal(kFiberModuleId) == 0);
     Require(sceSysmoduleUnloadModuleInternal(kFiberModuleId) == 0);
+    Require(sceSysmoduleIsLoaded(kFiberModuleId) == 0);
     Require(sceSysmoduleUnloadModuleInternal(kFiberModuleId) == 0);
-    Require(sceSysmoduleUnloadModuleInternal(kFiberModuleId) == kModuleNotLoaded);
+    Require(sceSysmoduleIsLoaded(kFiberModuleId) == kModuleUnloaded);
+    Require(sceSysmoduleUnloadModuleInternal(kFiberModuleId) == kModuleUnloaded);
+
+    Require(sceSysmoduleIsLoaded(kUltModuleId) == kModuleUnloaded);
+    Require(sceSysmoduleUnloadModule(kUltModuleId) == kModuleUnloaded);
+    Require(sceSysmoduleLoadModule(kUltModuleId) == 0);
+    Require(sceSysmoduleIsLoaded(kUltModuleId) == 0);
+    Require(sceSysmoduleUnloadModule(kUltModuleId) == 0);
+    Require(sceSysmoduleIsLoaded(kUltModuleId) == kModuleUnloaded);
 }