diff --git a/base/BUILD.gn b/base/BUILD.gn
index df4a030e4328..0afa1d812bc1 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -105,6 +105,7 @@ if (is_apple) {
          "mac requires mach absolute time ticks")
 }
 
+# TODO: b/384652502 - Cobalt: Fix compiler errors building hermetically.
 # ../../third_party/libevent/signal.c:43:10: fatal error: 'sys/queue.h' file not found
 # #include <sys/queue.h>
 # Determines whether libevent should be dep.
@@ -207,11 +208,7 @@ buildflag_header("ios_cronet_buildflags") {
   flags = [ "CRONET_BUILD=$is_cronet_build" ]
 }
 
-if (is_cobalt && is_starboard && use_custom_libc) {
-  enable_message_pump_epoll = false
-} else {
-  enable_message_pump_epoll = is_linux || is_chromeos || is_android
-}
+enable_message_pump_epoll = is_linux || is_chromeos || is_android
 
 buildflag_header("message_pump_buildflags") {
   header = "message_pump_buildflags.h"
@@ -1121,7 +1118,8 @@ component("base") {
     "//third_party/abseil-cpp:absl",
   ]
 
-  if (is_cobalt && is_starboard && use_custom_libc && current_toolchain == cobalt_toolchain) {
+  if (is_cobalt && is_starboard && use_custom_libc &&
+      current_toolchain == cobalt_toolchain) {
     deps -= [ "//base/allocator/partition_allocator:raw_ptr" ]
     deps += [ "//starboard:starboard_group" ]
   }
@@ -1705,7 +1703,8 @@ component("base") {
     }
 
     # TODO: b/384652502 - Cobalt: Fix compiler errors building hermetically.
-    if (is_cobalt && is_starboard && use_custom_libc && current_toolchain == cobalt_toolchain) {
+    if (is_cobalt && is_starboard && use_custom_libc &&
+        current_toolchain == cobalt_toolchain) {
       sources -= [
         "base_paths_posix.h",
         "memory/madv_free_discardable_memory_allocator_posix.cc",