diff --git a/deps/v8/src/snapshot/embedded/platform-embedded-file-writer-base.cc b/deps/v8/src/snapshot/embedded/platform-embedded-file-writer-base.cc
index e0602edc7e1c6a..e4ca7bfdacb11c 100644
--- a/deps/v8/src/snapshot/embedded/platform-embedded-file-writer-base.cc
+++ b/deps/v8/src/snapshot/embedded/platform-embedded-file-writer-base.cc
@@ -130,7 +130,8 @@ EmbeddedTargetOs ToEmbeddedTargetOs(const char* s) {
   }
 
   std::string string(s);
-  if (string == "aix") {
+  // Python 3.9+ on IBM i returns os400 as sys.platform instead of aix
+  if (string == "aix" || string == "os400") {
     return EmbeddedTargetOs::kAIX;
   } else if (string == "chromeos") {
     return EmbeddedTargetOs::kChromeOS;