diff --git a/src/util/WStringAPI.hxx b/src/util/WStringAPI.hxx
index e020ecd7f..c5aab37b6 100644
--- a/src/util/WStringAPI.hxx
+++ b/src/util/WStringAPI.hxx
@@ -101,7 +101,8 @@ gcc_nonnull_all
 static inline wchar_t *
 UnsafeCopyStringP(wchar_t *dest, const wchar_t *src)
 {
-#if defined(WIN32) || defined(__BIONIC__)
+#if defined(WIN32) || defined(__BIONIC__) || defined(__OpenBSD__) || \
+	defined(__NetBSD__)
   /* emulate wcpcpy() */
   UnsafeCopyString(dest, src);
   return dest + StringLength(dest);