diff --git a/auto/lib/md5/makefile.msvc b/auto/lib/md5/makefile.msvc
index ad719c0..65ca4ab 100644
--- a/auto/lib/md5/makefile.msvc
+++ b/auto/lib/md5/makefile.msvc
@@ -1,6 +1,16 @@
 
-CFLAGS = -nologo -c -MT -O2 -Ob1 -Oi -Gs $(LIB_OPT) -D MD5_ASM -D L_ENDIAN
+CFLAGS = -nologo -c -MT -O2 -Ob1 -Oi -Gs $(CPU_OPT) -D L_ENDIAN
+
+!if "$(MD5_ASM)" == "YES"
+
+md5.lib:
+	cl $(CFLAGS) -D MD5_ASM md5_dgst.c
+	link -lib -out:md5.lib md5_dgst.obj asm/m-win32.obj
+
+!else
 
 md5.lib:
 	cl $(CFLAGS) md5_dgst.c
-	link -lib -out:md5.lib md5_dgst.obj asm/m-win32.obj
+	link -lib -out:md5.lib md5_dgst.obj
+
+!endif