--- a/filesystems/fsw_btrfs_zstd.h
+++ b/filesystems/fsw_btrfs_zstd.h
@@ -4,7 +4,9 @@
  * All rights reserved.
  *
  */
-
+#ifdef PAGE_SIZE
+#undef PAGE_SIZE
+#endif
 #define PAGE_SIZE 4096
 #define uint64_t fsw_u64
 #define uint32_t fsw_u32