diff --git a/deps/openssl/openssl_common.gypi b/deps/openssl/openssl_common.gypi
index c4b95c20aea5d4..6a0b6f435548f5 100644
--- a/deps/openssl/openssl_common.gypi
+++ b/deps/openssl/openssl_common.gypi
@@ -24,7 +24,7 @@
     }, 'OS=="win"', {
       'defines': [
         ## default of Win. See INSTALL in openssl repo.
-        'OPENSSLDIR="C:\Program Files\Common Files\SSL"',
+        'OPENSSLDIR="C:\\\Program\ Files\\\Common\ Files\\\SSL"',
         'ENGINESDIR="NUL"',
         'OPENSSL_SYS_WIN32', 'WIN32_LEAN_AND_MEAN', 'L_ENDIAN',
         '_CRT_SECURE_NO_DEPRECATE', 'UNICODE', '_UNICODE',