diff --git a/contrib/liblzma/common/sysdefs_schnaader.h b/contrib/liblzma/common/sysdefs_schnaader.h
index 611434e..bd5b0b8 100644
--- a/contrib/liblzma/common/sysdefs_schnaader.h
+++ b/contrib/liblzma/common/sysdefs_schnaader.h
@@ -45,4 +45,6 @@
 #define HAVE_CHECK_CRC64 1
 #define HAVE_CHECK_SHA256 1
 
+#define NDEBUG 1
+
 #endif