diff --git a/cef.gyp b/cef.gyp
index 33c021793..2630f2e6d 100644
--- a/cef.gyp
+++ b/cef.gyp
@@ -64,6 +64,9 @@
             'cef_sandbox',
             'libcef',
           ],
+          'defines': [
+            'CEF_USE_SANDBOX',
+          ],
           'configurations': {
             'Debug_Base': {
               'msvs_settings': {
@@ -247,6 +250,9 @@
             'cef_sandbox',
             'libcef',
           ],
+          'defines': [
+            'CEF_USE_SANDBOX',
+          ],
           'configurations': {
             'Debug_Base': {
               'msvs_settings': {