diff --git a/deps/v8/include/v8-version.h b/deps/v8/include/v8-version.h
index 8de6adcf2269e8..cb85da2cd72a30 100644
--- a/deps/v8/include/v8-version.h
+++ b/deps/v8/include/v8-version.h
@@ -11,7 +11,7 @@
 #define V8_MAJOR_VERSION 6
 #define V8_MINOR_VERSION 4
 #define V8_BUILD_NUMBER 388
-#define V8_PATCH_LEVEL 45
+#define V8_PATCH_LEVEL 46
 
 // Use 1 for candidates and 0 otherwise.
 // (Boolean macro values are not supported by all preprocessors.)
diff --git a/deps/v8/src/heap/spaces.cc b/deps/v8/src/heap/spaces.cc
index 7657e1e6ec29d8..c3663573b028ef 100644
--- a/deps/v8/src/heap/spaces.cc
+++ b/deps/v8/src/heap/spaces.cc
@@ -351,8 +351,8 @@ void MemoryAllocator::Unmapper::WaitUntilCompleted() {
         CancelableTaskManager::kTaskAborted) {
       pending_unmapping_tasks_semaphore_.Wait();
     }
-    concurrent_unmapping_tasks_active_ = 0;
   }
+  concurrent_unmapping_tasks_active_ = 0;
 }
 
 template <MemoryAllocator::Unmapper::FreeMode mode>