diff --git a/tests/test/opt/tdfa7.pp b/tests/test/opt/tdfa7.pp
index 90cf5dcc92..f1265cc101 100644
--- a/tests/test/opt/tdfa7.pp
+++ b/tests/test/opt/tdfa7.pp
@@ -1,4 +1,4 @@
-{ %OPT=-Oodfa -Sew -vw }
+{ %OPT=-Oodfa -Sew -vw -Oonodeadvalues }
 type
   to1 = object
     procedure Init;
diff --git a/tests/webtbf/tw3631.pp b/tests/webtbf/tw3631.pp
index cd0eb48c94..edc7a82e14 100644
--- a/tests/webtbf/tw3631.pp
+++ b/tests/webtbf/tw3631.pp
@@ -1,5 +1,5 @@
 { %fail }
-{ %opt=-Sew -vw }
+{ %opt=-Sew -vw -Oonodeadvalues}
 
 var
   a : array[0..32] of byte;