diff --git a/brightray/brightray.gypi b/brightray/brightray.gypi
index 3f426666d9b..14d10cc7a16 100644
--- a/brightray/brightray.gypi
+++ b/brightray/brightray.gypi
@@ -80,7 +80,6 @@
         'msvs_settings': {
           'VCCLCompilerTool': {
             'Optimization': '<(win_debug_Optimization)',
-            'PreprocessorDefinitions': ['_DEBUG'],
             'BasicRuntimeChecks': '<(win_debug_RuntimeChecks)',
             # We use Release to match the version of chromiumcontent.dll we
             # link against.