diff --git a/mdds.spec b/mdds.spec
index 89c8cfb..c36584b 100644
--- a/mdds.spec
+++ b/mdds.spec
@@ -36,7 +36,7 @@ Headers for %{name}.
 %prep
 %setup -q -n %{name}_%{version}
 # this is only used in tests
-sed -i -e '/^CPPFLAGS/s/-Wall.*-std/%{optflags} -std/' Makefile.in
+sed -i -e '/^CPPFLAGS_NODEBUG=/s/=.*/="%{optflags}"/' configure
 
 %build
 %configure