diff --git a/src/node.cc b/src/node.cc
index 2057d4388acbff..03c01a656897f2 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -445,7 +445,7 @@ void ResetSignalHandlers() {
 #endif  // __POSIX__
 }
 
-static std::atomic<uint64_t> init_process_flags = 0;
+static std::atomic<uint32_t> init_process_flags = 0;
 
 static void PlatformInit(ProcessInitializationFlags::Flags flags) {
   // init_process_flags is accessed in ResetStdio(),
diff --git a/src/node.h b/src/node.h
index 845dbb9ef6ed37..58ff9010c78f31 100644
--- a/src/node.h
+++ b/src/node.h
@@ -228,6 +228,8 @@ class MultiIsolatePlatform;
 class InitializationResultImpl;
 
 namespace ProcessFlags {
+// TODO(addaleax): Switch to uint32_t to match std::atomic<uint32_t>
+// init_process_flags in node.cc
 enum Flags : uint64_t {
   kNoFlags = 0,
   // Enable stdio inheritance, which is disabled by default.