diff --git a/Source/Glitch64/inc/3dfx.h b/Source/Glitch64/inc/3dfx.h
index cbeb7b11e..0901130d4 100644
--- a/Source/Glitch64/inc/3dfx.h
+++ b/Source/Glitch64/inc/3dfx.h
@@ -88,6 +88,9 @@ typedef struct { float r, g, b, a; } FxColor4;
 #elif defined(__unix__)
 #  define FX_ENTRY extern
 #  define FX_CALL
+#elif defined(__APPLE__)
+#  define FX_ENTRY extern
+#  define FX_CALL
 #elif defined(__MWERKS__)
 #  if macintosh
 #    define FX_ENTRY extern
diff --git a/Source/Glitch64/inc/glidesys.h b/Source/Glitch64/inc/glidesys.h
index 4925b9d95..b19845a9a 100644
--- a/Source/Glitch64/inc/glidesys.h
+++ b/Source/Glitch64/inc/glidesys.h
@@ -116,7 +116,7 @@ n** -----------------------------------------------------------------------
 #  define GLIDE_OS        GLIDE_OS_DOS32
 #elif defined(__WIN32__)
 #  define GLIDE_OS        GLIDE_OS_WIN32
-#elif defined(macintosh)
+#elif defined(macintosh) || defined(__APPLE__)
 #  define GLIDE_OS        GLIDE_OS_MACOS
 #else
 #error "Unknown OS"