--- b/lz4.h
+++ a/lz4.h
@@ -582,6 +582,11 @@ union LZ4_streamDecode_u {
  *  Another method is to define LZ4_DISABLE_DEPRECATE_WARNINGS
  *  before including the header file.
  */
+
+#ifndef LZ4_DISABLE_DEPRECATE_WARNINGS
+#  define LZ4_DISABLE_DEPRECATE_WARNINGS
+#endif
+
 #ifdef LZ4_DISABLE_DEPRECATE_WARNINGS
 #  define LZ4_DEPRECATED(message)   /* disable deprecation warnings */
 #else