diff --git a/engine/src/flutter/fml/unique_fd.cc b/engine/src/flutter/fml/unique_fd.cc
index 45fd761308..09226c6014 100644
--- a/engine/src/flutter/fml/unique_fd.cc
+++ b/engine/src/flutter/fml/unique_fd.cc
@@ -11,23 +11,23 @@ namespace internal {
 
 #if OS_WIN
 
-namespace win {
+namespace os_win {
 
 void UniqueFDTraits::Free(HANDLE fd) {
   CloseHandle(fd);
 }
 
-}  // namespace win
+}  // namespace os_win
 
 #else  // OS_WIN
 
-namespace unix {
+namespace os_unix {
 
 void UniqueFDTraits::Free(int fd) {
   close(fd);
 }
 
-}  // namespace unix
+}  // namespace os_unix
 
 #endif  // OS_WIN
 
diff --git a/engine/src/flutter/fml/unique_fd.h b/engine/src/flutter/fml/unique_fd.h
index ac5b983bc8..05dee99018 100644
--- a/engine/src/flutter/fml/unique_fd.h
+++ b/engine/src/flutter/fml/unique_fd.h
@@ -23,7 +23,7 @@ namespace internal {
 
 #if OS_WIN
 
-namespace win {
+namespace os_win {
 
 struct UniqueFDTraits {
   static HANDLE InvalidValue() { return INVALID_HANDLE_VALUE; }
@@ -31,11 +31,11 @@ struct UniqueFDTraits {
   static void Free(HANDLE fd);
 };
 
-}  // namespace win
+}  // namespace os_win
 
 #else  // OS_WIN
 
-namespace unix {
+namespace os_unix {
 
 struct UniqueFDTraits {
   static int InvalidValue() { return -1; }
@@ -43,7 +43,7 @@ struct UniqueFDTraits {
   static void Free(int fd);
 };
 
-}  // namespace unix
+}  // namespace os_unix
 
 #endif  // OS_WIN
 
@@ -51,11 +51,11 @@ struct UniqueFDTraits {
 
 #if OS_WIN
 
-using UniqueFD = UniqueObject<HANDLE, internal::win::UniqueFDTraits>;
+using UniqueFD = UniqueObject<HANDLE, internal::os_win::UniqueFDTraits>;
 
 #else  // OS_WIN
 
-using UniqueFD = UniqueObject<int, internal::unix::UniqueFDTraits>;
+using UniqueFD = UniqueObject<int, internal::os_unix::UniqueFDTraits>;
 
 #endif  // OS_WIN