diff --git a/brightray/brightray.gypi b/brightray/brightray.gypi
index ed4fce523b9a..d03703ba4a36 100644
--- a/brightray/brightray.gypi
+++ b/brightray/brightray.gypi
@@ -136,9 +136,16 @@
               'USE_AURA',
             ],
           }],
-          ['OS not in ["mac", "win"]', {
+          ['OS in ["mac", "win"]', {
+            'defines': [
+              'USE_OPENSSL',
+            ],
+          }, {
             'defines': [
               'USE_X11',
+              # "use_nss_certs" is set to 1 in libchromiumcontent.
+              'USE_NSS_CERTS',
+              'USE_NSS',  # deprecated after Chrome 45.
             ],
           }],
           ['OS=="linux"', {
@@ -146,10 +153,6 @@
               '_LARGEFILE_SOURCE',
               '_LARGEFILE64_SOURCE',
               '_FILE_OFFSET_BITS=64',
-              # "use_nss_certs" is set to 1 in libchromiumcontent.
-              'USE_NSS_CERTS',
-              # USE_NSS is set to be compatible with Chrome < 45.
-              'USE_NSS',
             ],
             'cflags_cc': [
               '-D__STRICT_ANSI__',