diff --git a/fips/des/fips_desmovs.c b/fips/des/fips_desmovs.c
index 0ebd8c933..9357f0a4b 100644
--- a/fips/des/fips_desmovs.c
+++ b/fips/des/fips_desmovs.c
@@ -324,7 +324,7 @@ void do_mct(char *amode,
 	    /* accumulate material for the next key */
 	    shiftin(nk,text,Sizes[imode]);
 	    /*	    DebugValue("nk",nk,8); */
-	    if(imode == CFB1 || imode == CFB8 || imode == CBC)
+	    if(dir && (imode == CFB1 || imode == CFB8 || imode == CBC))
 		memcpy(text,old_iv,8);
 	    }
 	for(n=0 ; n < 8 ; ++n)