diff --git a/include/cef_linux.h b/include/cef_linux.h
index a8aea79f9..1f59468f1 100644
--- a/include/cef_linux.h
+++ b/include/cef_linux.h
@@ -31,7 +31,7 @@
 #ifndef _CEF_LINUX_H
 #define _CEF_LINUX_H
 
-#if defined(__linux__)
+#if defined(OS_LINUX)
 #include <pthread.h>
 #include "cef_types_linux.h"
 #include "cef_types_wrappers.h"
@@ -122,6 +122,6 @@ struct CefPrintInfoTraits {
 // Class representing print context information.
 typedef CefStructBase<CefPrintInfoTraits> CefPrintInfo;
 
-#endif // defined(__linux__)
+#endif // OS_LINUX
 
 #endif // _CEF_LINUX_H
diff --git a/include/cef_mac.h b/include/cef_mac.h
index b3393738e..b949343af 100644
--- a/include/cef_mac.h
+++ b/include/cef_mac.h
@@ -31,7 +31,7 @@
 #ifndef _CEF_MAC_H
 #define _CEF_MAC_H
 
-#if defined(__APPLE__)
+#if defined(OS_MACOSX)
 #include <pthread.h>
 #include "cef_types_mac.h"
 #include "cef_types_wrappers.h"
@@ -139,6 +139,6 @@ struct CefPrintInfoTraits {
 // Class representing print context information.
 typedef CefStructBase<CefPrintInfoTraits> CefPrintInfo;
 
-#endif // defined(__APPLE__)
+#endif // OS_MACOSX
 
 #endif // _CEF_MAC_H
diff --git a/include/cef_win.h b/include/cef_win.h
index 66e8a2349..5883d009d 100644
--- a/include/cef_win.h
+++ b/include/cef_win.h
@@ -31,7 +31,7 @@
 #ifndef _CEF_WIN_H
 #define _CEF_WIN_H
 
-#ifdef _WIN32
+#if defined(OS_WIN)
 #include <windows.h>
 #include "cef_types_win.h"
 #include "cef_types_wrappers.h"
@@ -156,6 +156,6 @@ struct CefPrintInfoTraits {
 // Class representing print context information.
 typedef CefStructBase<CefPrintInfoTraits> CefPrintInfo;
 
-#endif // _WIN32
+#endif // OS_WIN
 
 #endif // _CEF_WIN_H