diff --git a/common.gypi b/common.gypi
index 6b7a7de3c97..726b234aa53 100644
--- a/common.gypi
+++ b/common.gypi
@@ -175,9 +175,6 @@
             'EnableFunctionLevelLinking': 'true',
             'EnableIntrinsicFunctions': 'true',
             'RuntimeTypeInfo': 'false',
-            'AdditionalOptions': [
-              '/MP', # compile across multiple CPUs
-            ],
           },
           'VCLibrarianTool': {
             'AdditionalOptions': [
@@ -210,6 +207,9 @@
         # and their sheer number drowns out other, more legitimate warnings.
         'DisableSpecificWarnings': ['4267'],
         'WarnAsError': 'false',
+        'AdditionalOptions': [
+          '/MP', # compile across multiple CPUs
+        ],
       },
       'VCLibrarianTool': {
       },