diff --git a/common.gypi b/common.gypi
index 23196aae451f6a..a6a79adcc2fb4f 100644
--- a/common.gypi
+++ b/common.gypi
@@ -36,7 +36,7 @@
 
     # Reset this number to 0 on major V8 upgrades.
     # Increment by one for each non-official patch applied to deps/v8.
-    'v8_embedder_string': '-node.11',
+    'v8_embedder_string': '-node.12',
 
     ##### V8 defaults for Node.js #####
 
diff --git a/deps/v8/include/v8config.h b/deps/v8/include/v8config.h
index b6d087b958edc1..73a6a91d49bf0e 100644
--- a/deps/v8/include/v8config.h
+++ b/deps/v8/include/v8config.h
@@ -581,11 +581,15 @@ path. Add it with -I<path> to the command line
 // functions.
 // Use like:
 //   V8_NOINLINE V8_PRESERVE_MOST void UnlikelyMethod();
+#if V8_OS_WIN
+# define V8_PRESERVE_MOST
+#else
 #if V8_HAS_ATTRIBUTE_PRESERVE_MOST
 # define V8_PRESERVE_MOST __attribute__((preserve_most))
 #else
 # define V8_PRESERVE_MOST /* NOT SUPPORTED */
 #endif
+#endif
 
 
 // A macro (V8_DEPRECATED) to mark classes or functions as deprecated.