diff --git a/Sources/System/FilePath/FilePathComponents.swift b/Sources/System/FilePath/FilePathComponents.swift
index 7bb55d59..d7ca9d47 100644
--- a/Sources/System/FilePath/FilePathComponents.swift
+++ b/Sources/System/FilePath/FilePathComponents.swift
@@ -190,6 +190,7 @@ extension FilePath.Root: _PathSlice {
   }
 }
 extension FilePath: _PlatformStringable {
+  @usableFromInline
   func _withPlatformString<Result>(_ body: (UnsafePointer<CInterop.PlatformChar>) throws -> Result) rethrows -> Result {
     try _storage.withPlatformString(body)
   }