diff --git a/BUILD.gn b/BUILD.gn
index da23872..b405f51 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -41,15 +41,8 @@
                     # of signed shorts.
       ]
     }
-
-    cflags_cc = [ "/std:c++17" ]
-  } else {
-    cflags_cc = [ "-std=c++17" ]
-    cflags_objcc = [ "-std=c++17" ]
-
-    if (!is_debug) {
-      cflags += [ "-Os" ]
-    }
+  } else if (!is_debug) {
+    cflags += [ "-Os" ]
   }
 
   if (build_with_chromium) {