diff --git a/deps/v8/src/log-utils.cc b/deps/v8/src/log-utils.cc
index 7bd7baa2d8..5e607daa9a 100644
--- a/deps/v8/src/log-utils.cc
+++ b/deps/v8/src/log-utils.cc
@@ -105,6 +105,10 @@ void Log::Initialize() {
                 // one character so we can escape the loop properly.
                 p--;
                 break;
+              case 'p':
+                // %p expands to the process ID.
+                stream.Add("%d", OS::GetCurrentProcessId());
+                break;
               case 't': {
                 // %t expands to the current time in milliseconds.
                 double time = OS::TimeCurrentMillis();