diff --git a/common.gypi b/common.gypi
index 9ecfc4d2a3..3b08a7f8a3 100644
--- a/common.gypi
+++ b/common.gypi
@@ -17,7 +17,9 @@
 
     # Enable V8's post-mortem debugging only on unix flavors.
     'conditions': [
-      ['OS != "win"', {
+      ['OS == "win"', {
+        'v8_postmortem_support': 'false'
+      }, {
         'v8_postmortem_support': 'true'
       }]
     ],