diff --git a/c_src/mac/keyio_mac.hpp b/c_src/mac/keyio_mac.hpp
index d2cc0a45..30883457 100644
--- a/c_src/mac/keyio_mac.hpp
+++ b/c_src/mac/keyio_mac.hpp
@@ -6,6 +6,12 @@
 #include <map>
 #include <iostream>
 #include <mach/mach_error.h>
+#include <AvailabilityMacros.h>
+
+/* The name was changed from "Master" to "Main" in Apple SDK 12.0 (Monterey) */
+#if !defined (MAC_OS_X_VERSION_12_0) || (MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_12_0)
+    #define kIOMainPortDefault kIOMasterPortDefault
+#endif
 
 int init_sink(void);
 int exit_sink(void);