diff --git a/apps/installer.cpp b/apps/installer.cpp
index 50465e6..1caf154 100644
--- a/apps/installer.cpp
+++ b/apps/installer.cpp
@@ -948,11 +948,11 @@ void ButtonInstallOptions(EsInstance *, EsElement *, EsCommand *) {
 }
 
 void ButtonShutdown(EsInstance *, EsElement *, EsCommand *) {
-	EsSyscall(ES_SYSCALL_SHUTDOWN, SHUTDOWN_ACTION_POWER_OFF, 0, 0, 0);
+	EsSyscall(ES_SYSCALL_SHUTDOWN, ES_SHUTDOWN_ACTION_POWER_OFF, 0, 0, 0);
 }
 
 void ButtonRestart(EsInstance *, EsElement *, EsCommand *) {
-	EsSyscall(ES_SYSCALL_SHUTDOWN, SHUTDOWN_ACTION_RESTART, 0, 0, 0);
+	EsSyscall(ES_SYSCALL_SHUTDOWN, ES_SHUTDOWN_ACTION_RESTART, 0, 0, 0);
 }
 
 void ButtonInstall(EsInstance *, EsElement *, EsCommand *) {
diff --git a/desktop/api.cpp b/desktop/api.cpp
index 3ca20a6..c2aa850 100644
--- a/desktop/api.cpp
+++ b/desktop/api.cpp
@@ -553,6 +553,10 @@ void EsSystemShowShutdownDialog() {
 	MessageDesktop(&message, 1);
 }
 
+void EsSystemShutdown(uint32_t action) {
+	EsSyscall(ES_SYSCALL_SHUTDOWN, action, 0, 0, 0);
+}
+
 void EsSystemConfigurationReadFileTypes(EsBuffer *buffer) {
 	uint8_t m = DESKTOP_MSG_FILE_TYPES_GET;
 	MessageDesktop(&m, 1, ES_INVALID_HANDLE, buffer);
diff --git a/desktop/api_tests.cpp b/desktop/api_tests.cpp
index 43cad91..5c3aaff 100644
--- a/desktop/api_tests.cpp
+++ b/desktop/api_tests.cpp
@@ -1229,7 +1229,7 @@ bool RestartTest() {
 	index++;
 	if (ES_SUCCESS != EsFileWriteAll(EsLiteral("|Settings:/restart_test.txt"), &index, sizeof(uint32_t))) return false;
 	EsPrint("Restart %d...\n", index);
-	EsSyscall(ES_SYSCALL_SHUTDOWN, SHUTDOWN_ACTION_RESTART, 0, 0, 0);
+	EsSyscall(ES_SYSCALL_SHUTDOWN, ES_SHUTDOWN_ACTION_RESTART, 0, 0, 0);
 	while (EsMessageReceive());
 	return false;
 }
@@ -1345,7 +1345,7 @@ void RunTests() {
 		}
 	}
 
-	EsSyscall(ES_SYSCALL_SHUTDOWN, SHUTDOWN_ACTION_POWER_OFF, 0, 0, 0);
+	EsSyscall(ES_SYSCALL_SHUTDOWN, ES_SHUTDOWN_ACTION_POWER_OFF, 0, 0, 0);
 	EsProcessTerminateCurrent();
 }
 
diff --git a/desktop/desktop.cpp b/desktop/desktop.cpp
index 225021c..53b1055 100644
--- a/desktop/desktop.cpp
+++ b/desktop/desktop.cpp
@@ -1418,11 +1418,11 @@ void ShutdownModalCreate() {
 	// Setup command callbacks when the buttons are pressed.
 
 	EsButtonOnCommand(shutdownButton, [] (EsInstance *, EsElement *, EsCommand *) {
-		Shutdown(SHUTDOWN_ACTION_POWER_OFF);
+		Shutdown(ES_SHUTDOWN_ACTION_POWER_OFF);
 	});
 
 	EsButtonOnCommand(restartButton, [] (EsInstance *, EsElement *, EsCommand *) {
-		Shutdown(SHUTDOWN_ACTION_RESTART);
+		Shutdown(ES_SHUTDOWN_ACTION_RESTART);
 	});
 
 	EsButtonOnCommand(cancelButton, [] (EsInstance *, EsElement *element, EsCommand *) {
diff --git a/desktop/os.header b/desktop/os.header
index ea2d0af..cffa83a 100644
--- a/desktop/os.header
+++ b/desktop/os.header
@@ -779,6 +779,9 @@ define ES_LIST_VIEW_CHOOSE_ITEM_ENTER        (2)
 define ES_LIST_VIEW_CHOOSE_ITEM_DOUBLE_CLICK (3)
 define ES_LIST_VIEW_CHOOSE_ITEM_MIDDLE_CLICK (4)
 
+define ES_SHUTDOWN_ACTION_POWER_OFF (1)
+define ES_SHUTDOWN_ACTION_RESTART (2)
+
 include desktop/icons.header
 
 enum EsFatalError {
@@ -1984,6 +1987,7 @@ function EsHandle EsTakeSystemSnapshot(int type, size_t *bufferSize);
 function EsInstance *_EsInstanceCreate(size_t bytes, EsMessage *message, STRING name = BLANK_STRING); 
 function EsError EsHandleClose(EsHandle handle); 
 function void EsSystemShowShutdownDialog();
+function void EsSystemShutdown(uint32_t action);
 
 function void EsPOSIXInitialise(int *argc, char ***argv); 
 function long EsPOSIXSystemCall(long n, long a1, long a2, long a3, long a4, long a5, long a6); 
diff --git a/desktop/prefix.h b/desktop/prefix.h
index c62c28d..bc6e4fd 100644
--- a/desktop/prefix.h
+++ b/desktop/prefix.h
@@ -378,9 +378,6 @@ struct SystemStartupDataHeader {
 #define CURSOR_SPEED(x) ((x) >> 16)
 #define CURSOR_TRAILS(x) (((x) >> 13) & 7)
 
-#define SHUTDOWN_ACTION_POWER_OFF (1)
-#define SHUTDOWN_ACTION_RESTART (2)
-
 #ifdef __cplusplus
 extern "C" const void *EsBufferRead(struct EsBuffer *buffer, size_t readBytes);
 extern "C" const void *EsBufferReadMany(struct EsBuffer *buffer, size_t a, size_t b);
diff --git a/drivers/acpi.cpp b/drivers/acpi.cpp
index 1c86071..69e1ea6 100644
--- a/drivers/acpi.cpp
+++ b/drivers/acpi.cpp
@@ -329,7 +329,7 @@ CPULocalStorage *KGetCPULocal(uintptr_t index) {
 #include "acpica.cpp"
 #else
 void ArchShutdown() {
-	if (shutdownAction == SHUTDOWN_ACTION_RESTART) ProcessorReset();
+	if (shutdownAction == ES_SHUTDOWN_ACTION_RESTART) ProcessorReset();
 	StartDebugOutput();
 	EsPrint("\nIt's now safe to turn off your computer.\n");
 	ProcessorDisableInterrupts();
diff --git a/drivers/acpica.cpp b/drivers/acpica.cpp
index 24dea2a..00dd538 100644
--- a/drivers/acpica.cpp
+++ b/drivers/acpica.cpp
@@ -595,7 +595,7 @@ ACPI_STATUS ACPIWalkNamespaceCallback(ACPI_HANDLE object, uint32_t depth, void *
 }
 
 void ArchShutdown() {
-	if (shutdownAction == SHUTDOWN_ACTION_RESTART) ProcessorReset();
+	if (shutdownAction == ES_SHUTDOWN_ACTION_RESTART) ProcessorReset();
 	AcpiEnterSleepStatePrep(5);
 	ProcessorDisableInterrupts();
 	AcpiEnterSleepState(5);
diff --git a/util/api_table.ini b/util/api_table.ini
index 0da9008..ec83299 100644
--- a/util/api_table.ini
+++ b/util/api_table.ini
@@ -340,6 +340,7 @@ EsClipboardReadText=338
 EsClipboardOpen=339
 EsSpacerCreate=340
 EsTextPlanCreate=341
+EsSystemShutdown=342
 EsListDisplayCreate=343
 EsCRTfabsf=344
 EsCRTisnanf=345