diff --git a/CPP/7zip/Bundles/Alone/makefile b/CPP/7zip/Bundles/Alone/makefile
index e63fbdcd..c093e0cf 100644
--- a/CPP/7zip/Bundles/Alone/makefile
+++ b/CPP/7zip/Bundles/Alone/makefile
@@ -1,6 +1,6 @@
 PROG = 7za.exe
 MY_CONSOLE = 1
-CFLAGS = $(CFLAGS)
+CFLAGS = $(CFLAGS) -DZSTD_MULTITHREAD
 
 !IFNDEF UNDER_CE
 CFLAGS = $(CFLAGS) -DWIN_LONG_PATH -D_7ZIP_LARGE_PAGES -DSUPPORT_DEVICE_FILE