diff --git a/tools/automate.py b/tools/automate.py
index f9b470fe..84bd9bb2 100644
--- a/tools/automate.py
+++ b/tools/automate.py
@@ -870,8 +870,9 @@ def getenv():
     # GN configuration
     env["CEF_USE_GN"] = "1"
     # Issue #73 patch applied here with "use_allocator=none"
-    env["GN_DEFINES"] = "use_sysroot=true use_allocator=none symbol_level=0 use_jumbo_build=true"
-    env["GN_DEFINES"] += " use_gtk3=true use_cups=false use_gnome_keyring=false use_vaapi=true"
+    env["GN_DEFINES"] = "use_sysroot=false use_allocator=none symbol_level=0 use_jumbo_build=true"
+    env["GN_DEFINES"] += " use_vaapi=true proprietary_codecs=true"
+    env["GN_DEFINES"] += " use_gtk3=true use_cups=false use_gnome_keyring=false"
     env["GN_DEFINES"] += " enable_reporting=false enable_remoting=false enable_nacl=false"
     # To perform an official build set GYP_DEFINES=buildtype=Official.
     # This will disable debugging code and enable additional link-time