diff --git a/src/Platform_Posix.c b/src/Platform_Posix.c
index 177422fb7..3ee1f3b6e 100644
--- a/src/Platform_Posix.c
+++ b/src/Platform_Posix.c
@@ -1451,6 +1451,10 @@ static cc_result GetMachineID(cc_uint32* key) {
 	return res;
 }
 #elif defined CC_BUILD_MACOS
+/* kIOMasterPortDefault is deprecated since macOS 12.0 (replaced with kIOMainPortDefault) */
+/* And since kIOMasterPortDefault is just 0/NULL anyways, just manually declare it */
+static const mach_port_t masterPortDefault = 0;
+
 /* Read kIOPlatformUUIDKey from I/O registry for the key */
 static cc_result GetMachineID(cc_uint32* key) {
 	io_registry_entry_t registry;
@@ -1458,7 +1462,7 @@ static cc_result GetMachineID(cc_uint32* key) {
 	char tmp[256] = { 0 };
 
 #ifdef kIOPlatformUUIDKey
-    registry = IORegistryEntryFromPath(kIOMasterPortDefault, "IOService:/");
+    registry = IORegistryEntryFromPath(masterPortDefault, "IOService:/");
     if (!registry) return ERR_NOT_SUPPORTED;
 
 	devID = IORegistryEntryCreateCFProperty(registry, CFSTR(kIOPlatformUUIDKey), kCFAllocatorDefault, 0);
@@ -1466,7 +1470,7 @@ static cc_result GetMachineID(cc_uint32* key) {
 		DecodeMachineID(tmp, String_Length(tmp), key);	
 	}
 #else
-    registry = IOServiceGetMatchingService(kIOMasterPortDefault,
+    registry = IOServiceGetMatchingService(masterPortDefault,
                                            IOServiceMatching("IOPlatformExpertDevice"));
 
     devID = IORegistryEntryCreateCFProperty(registry, CFSTR(kIOPlatformSerialNumberKey), kCFAllocatorDefault, 0);