diff --git a/include/linux/zlib.h b/include/linux/zlib.h
index 850076e..74f7b78 100644
--- a/include/linux/zlib.h
+++ b/include/linux/zlib.h
@@ -506,6 +506,11 @@
    stream state was inconsistent (such as zalloc or state being NULL).
 */
 
+static inline unsigned long deflateBound(unsigned long s)
+{
+	return s + ((s + 7) >> 3) + ((s + 63) >> 6) + 11;
+}
+
 extern int zlib_deflateParams (z_streamp strm, int level, int strategy);
 /*
      Dynamically update the compression level and compression strategy.  The