diff --git a/addons/godot_xterm/native/SConstruct b/addons/godot_xterm/native/SConstruct
index d5f58e6..6ef6a7d 100644
--- a/addons/godot_xterm/native/SConstruct
+++ b/addons/godot_xterm/native/SConstruct
@@ -72,7 +72,7 @@ env.AppendENVPath('PATH', os.getenv('PATH'))
 
 # Compile for Linux.
 if env['platform'] == 'linux':
-    env.Append(CPPDEFINES=['PLATFORM_LINUX'])
+    env.Append(CPPDEFINES=['__linux__'])
 
     env['CC'] = 'gcc'
     env['CXX'] = 'g++'
@@ -95,7 +95,7 @@ if env['platform'] == 'linux':
 
 # Compile for HTML5.
 elif env['platform'] == 'javascript':
-    env.Append(CPPDEFINES=['PLATFORM_JS'])
+    env.Append(CPPDEFINES=['__EMSCRIPTEN__'])
 
     env['bits'] = '32'
     env['CC'] = 'emcc'
@@ -118,7 +118,7 @@ elif env['platform'] == 'javascript':
 
 # Compile for OSX.
 elif env['platform'] == 'osx':
-    env.Append(CPPDEFINES=['PLATFORM_OSX'])
+    env.Append(CPPDEFINES=['__APPLE__'])
 
     env['CC'] = 'clang'
     env['CXX'] = 'clang++'
@@ -144,7 +144,7 @@ elif env['platform'] == 'osx':
 
 # Compile for Windows.
 elif env['platform'] == 'windows':
-    env.Append(CPPDEFINES=['PLATFORM_WINDOWS'])
+    env.Append(CPPDEFINES=['__WIN32'])
     env['LIBSUFFIX'] = '.lib'
 
     # On Windows using MSVC.
diff --git a/addons/godot_xterm/native/src/libgodotxtermnative.cpp b/addons/godot_xterm/native/src/libgodotxtermnative.cpp
index 0664156..3a4a6f6 100644
--- a/addons/godot_xterm/native/src/libgodotxtermnative.cpp
+++ b/addons/godot_xterm/native/src/libgodotxtermnative.cpp
@@ -1,5 +1,5 @@
 #include "terminal.h"
-#if defined(PLATFORM_LINUX) || defined(PLATFORM_OSX)
+#if defined(__unix__) // Linux and macOS.
 #include "pseudoterminal.h"
 #endif
 
@@ -16,7 +16,7 @@ extern "C" void GDN_EXPORT godot_nativescript_init(void *handle) {
   godot::Godot::nativescript_init(handle);
 
   godot::register_tool_class<godot::Terminal>();
-#if defined(PLATFORM_LINUX) || defined(PLATFORM_OSX)
+#if defined(__unix__)
   godot::register_class<godot::Pseudoterminal>();
 #endif
 }
diff --git a/addons/godot_xterm/native/src/pseudoterminal.cpp b/addons/godot_xterm/native/src/pseudoterminal.cpp
index 0708b96..09666cc 100644
--- a/addons/godot_xterm/native/src/pseudoterminal.cpp
+++ b/addons/godot_xterm/native/src/pseudoterminal.cpp
@@ -5,10 +5,10 @@
 #include <unistd.h>
 
 // Platform specific includes.
-#if defined(PLATFORM_LINUX)
+#if defined(__linux__)
 #include <pty.h>
 #endif
-#if defined(PLATFORM_OSX)
+#if defined(__APPLE__)
 #include <sys/ioctl.h>
 #include <util.h>
 #endif
diff --git a/addons/godot_xterm/native/src/terminal.cpp b/addons/godot_xterm/native/src/terminal.cpp
index 425c999..cc271d6 100644
--- a/addons/godot_xterm/native/src/terminal.cpp
+++ b/addons/godot_xterm/native/src/terminal.cpp
@@ -8,7 +8,7 @@
 #include <xkbcommon/xkbcommon-keysyms.h>
 
 // For _populate_key_list(), see below.
-#if defined(PLATFORM_WINDOWS)
+#if defined(__WIN32)
 #include <GlobalConstants.hpp>
 #endif
 
@@ -26,7 +26,7 @@ void Terminal::_populate_key_list() {
 // referenced in function "private: static void __cdecl
 // godot::Terminal::_populate_key_list(void)"` so use the old technique of
 // getting KeyList values from GlobalConstants header for now.
-#if defined(PLATFORM_WINDOWS)
+#if defined(__WIN32)
 #define GLOBAL_CONSTANT(VAR) GlobalConstants::VAR
 #else
 #define GLOBAL_CONSTANT(VAR) get_constant(#VAR)