diff --git a/src/diff.c b/src/diff.c
index d5cb97c..82be8b9 100644
--- a/src/diff.c
+++ b/src/diff.c
@@ -1083,10 +1083,7 @@
 	curwin = wp;
 	curbuf = curwin->w_buffer;
 	set_string_option_direct((char_u *)"fdm", -1, (char_u *)"diff",
-							  OPT_LOCAL|OPT_FREE);
-# ifdef FEAT_EVAL
-	set_option_scriptID((char_u *)"fdm", current_SID);
-# endif
+						       OPT_LOCAL|OPT_FREE, 0);
 	curwin = old_curwin;
 	curbuf = curwin->w_buffer;
 	wp->w_p_fdc = 2;
@@ -1133,10 +1130,7 @@
 	    curwin = wp;
 	    curbuf = curwin->w_buffer;
 	    set_string_option_direct((char_u *)"fdm", -1,
-				      (char_u *)"manual", OPT_LOCAL|OPT_FREE);
-# ifdef FEAT_EVAL
-	    set_option_scriptID((char_u *)"fdm", current_SID);
-# endif
+				   (char_u *)"manual", OPT_LOCAL|OPT_FREE, 0);
 	    curwin = old_curwin;
 	    curbuf = curwin->w_buffer;
 	    wp->w_p_fdc = 0;