diff --git a/common.gypi b/common.gypi
index e991903625..638411ccf4 100644
--- a/common.gypi
+++ b/common.gypi
@@ -38,7 +38,7 @@
 
     # 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/src/base/macros.h b/deps/v8/src/base/macros.h
index 03f5e4cdd7..fbb6ac7190 100644
--- a/deps/v8/src/base/macros.h
+++ b/deps/v8/src/base/macros.h
@@ -442,9 +442,9 @@ bool is_inbounds(float_t v) {
 // Setup for Windows shared library export.
 #define V8_EXPORT_ENUM
 #ifdef BUILDING_V8_SHARED_PRIVATE
-#define V8_EXPORT_PRIVATE
+#define V8_EXPORT_PRIVATE __declspec(dllexport)
 #elif USING_V8_SHARED_PRIVATE
-#define V8_EXPORT_PRIVATE
+#define V8_EXPORT_PRIVATE __declspec(dllimport)
 #else
 #define V8_EXPORT_PRIVATE
 #endif  // BUILDING_V8_SHARED
@@ -454,7 +454,7 @@ bool is_inbounds(float_t v) {
 // Setup for Linux shared library export.
 #if V8_HAS_ATTRIBUTE_VISIBILITY && \
     (defined(BUILDING_V8_SHARED_PRIVATE) || USING_V8_SHARED_PRIVATE)
-#define V8_EXPORT_PRIVATE
+#define V8_EXPORT_PRIVATE __attribute__((visibility("default")))
 #define V8_EXPORT_ENUM V8_EXPORT_PRIVATE
 #else
 #define V8_EXPORT_PRIVATE