diff --git a/include/boost/predef/platform/windows_desktop.h b/include/boost/predef/platform/windows_desktop.h
index 9d3a5b0..286c273 100644
--- a/include/boost/predef/platform/windows_desktop.h
+++ b/include/boost/predef/platform/windows_desktop.h
@@ -31,7 +31,7 @@ http://www.boost.org/LICENSE_1_0.txt)
 #   define BOOST_PLAT_WINDOWS_DESKTOP BOOST_VERSION_NUMBER_AVAILABLE
 #endif
  
-#ifdef BOOST_PLAT_WINDOWS_DESKTOP
+#if BOOST_PLAT_WINDOWS_DESKTOP
 #   define BOOST_PLAT_WINDOWS_DESKTOP_AVALIABLE
 #   include <boost/predef/detail/platform_detected.h>
 #endif
diff --git a/include/boost/predef/platform/windows_phone.h b/include/boost/predef/platform/windows_phone.h
index 38a4a73..cdf79d1 100644
--- a/include/boost/predef/platform/windows_phone.h
+++ b/include/boost/predef/platform/windows_phone.h
@@ -29,7 +29,7 @@ http://www.boost.org/LICENSE_1_0.txt)
 #   define BOOST_PLAT_WINDOWS_PHONE BOOST_VERSION_NUMBER_AVAILABLE
 #endif
  
-#ifdef BOOST_PLAT_WINDOWS_PHONE
+#if BOOST_PLAT_WINDOWS_PHONE
 #   define BOOST_PLAT_WINDOWS_PHONE_AVALIABLE
 #   include <boost/predef/detail/platform_detected.h>
 #endif
diff --git a/include/boost/predef/platform/windows_runtime.h b/include/boost/predef/platform/windows_runtime.h
index 7481133..1444938 100644
--- a/include/boost/predef/platform/windows_runtime.h
+++ b/include/boost/predef/platform/windows_runtime.h
@@ -31,7 +31,7 @@ http://www.boost.org/LICENSE_1_0.txt)
 #   define BOOST_PLAT_WINDOWS_RUNTIME BOOST_VERSION_NUMBER_AVAILABLE
 #endif
  
-#ifdef BOOST_PLAT_WINDOWS_RUNTIME
+#if BOOST_PLAT_WINDOWS_RUNTIME
 #   define BOOST_PLAT_WINDOWS_RUNTIME_AVALIABLE
 #   include <boost/predef/detail/platform_detected.h>
 #endif
diff --git a/include/boost/predef/platform/windows_store.h b/include/boost/predef/platform/windows_store.h
index e8484e4..0487c0f 100644
--- a/include/boost/predef/platform/windows_store.h
+++ b/include/boost/predef/platform/windows_store.h
@@ -29,7 +29,7 @@ http://www.boost.org/LICENSE_1_0.txt)
 #   define BOOST_PLAT_WINDOWS_STORE BOOST_VERSION_NUMBER_AVAILABLE
 #endif
  
-#ifdef BOOST_PLAT_WINDOWS_STORE
+#if BOOST_PLAT_WINDOWS_STORE
 #   define BOOST_PLAT_WINDOWS_STORE_AVALIABLE
 #   include <boost/predef/detail/platform_detected.h>
 #endif