diff --git a/include/boost/predef/platform/windows_phone.h b/include/boost/predef/platform/windows_phone.h
index 90ea5ed..38a4a73 100644
--- a/include/boost/predef/platform/windows_phone.h
+++ b/include/boost/predef/platform/windows_phone.h
@@ -24,7 +24,7 @@ http://www.boost.org/LICENSE_1_0.txt)
 
 #define BOOST_PLAT_WINDOWS_PHONE BOOST_VERSION_NUMBER_NOT_AVAILABLE
 
-#if BOOST_OS_WINDOWS && WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP
+#if BOOST_OS_WINDOWS && defined(WINAPI_FAMILY) && WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP
 #   undef BOOST_PLAT_WINDOWS_PHONE
 #   define BOOST_PLAT_WINDOWS_PHONE BOOST_VERSION_NUMBER_AVAILABLE
 #endif
diff --git a/include/boost/predef/platform/windows_runtime.h b/include/boost/predef/platform/windows_runtime.h
index 1440fe3..7481133 100644
--- a/include/boost/predef/platform/windows_runtime.h
+++ b/include/boost/predef/platform/windows_runtime.h
@@ -25,7 +25,7 @@ http://www.boost.org/LICENSE_1_0.txt)
 
 #define BOOST_PLAT_WINDOWS_RUNTIME BOOST_VERSION_NUMBER_NOT_AVAILABLE
 
-#if BOOST_OS_WINDOWS && \
+#if BOOST_OS_WINDOWS && defined(WINAPI_FAMILY) && \
     ( WINAPI_FAMILY == WINAPI_FAMILY_APP || WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP )
 #   undef BOOST_PLAT_WINDOWS_RUNTIME
 #   define BOOST_PLAT_WINDOWS_RUNTIME BOOST_VERSION_NUMBER_AVAILABLE
diff --git a/include/boost/predef/platform/windows_store.h b/include/boost/predef/platform/windows_store.h
index 641c7b9..e8484e4 100644
--- a/include/boost/predef/platform/windows_store.h
+++ b/include/boost/predef/platform/windows_store.h
@@ -24,7 +24,7 @@ http://www.boost.org/LICENSE_1_0.txt)
 
 #define BOOST_PLAT_WINDOWS_STORE BOOST_VERSION_NUMBER_NOT_AVAILABLE
 
-#if BOOST_OS_WINDOWS && WINAPI_FAMILY == WINAPI_FAMILY_APP
+#if BOOST_OS_WINDOWS && defined(WINAPI_FAMILY) && WINAPI_FAMILY == WINAPI_FAMILY_APP
 #   undef BOOST_PLAT_WINDOWS_STORE
 #   define BOOST_PLAT_WINDOWS_STORE BOOST_VERSION_NUMBER_AVAILABLE
 #endif