diff --git a/Sources/TSCBasic/WritableByteStream.swift b/Sources/TSCBasic/WritableByteStream.swift
index a68ff8d0..c47ae931 100644
--- a/Sources/TSCBasic/WritableByteStream.swift
+++ b/Sources/TSCBasic/WritableByteStream.swift
@@ -66,7 +66,7 @@ public extension WritableByteStream {
 // Public alias to the old name to not introduce API compatibility.
 public typealias OutputByteStream = WritableByteStream
 
-#if os(Android)
+#if os(Android) || os(OpenBSD)
 public typealias FILEPointer = OpaquePointer
 #else
 public typealias FILEPointer = UnsafeMutablePointer<FILE>