diff --git a/Changes b/Changes
index b0ecece09..e48c6a1da 100644
--- a/Changes
+++ b/Changes
@@ -2039,3 +2039,6 @@
 - Give more clear error to users who use ``make custommodule'' without
   MODULEFILE. (#3935)
 - Support compiling with a bundled c-ares again, the hacky way. (#3931)
+- The configure.ac change silently changed the nospoof parameter in
+  ./configure. This meant that the answer to NOSPOOF in ./Config was ignored
+  and it was always enabled.
diff --git a/Config b/Config
index d70de4c4b..631ecca96 100755
--- a/Config
+++ b/Config
@@ -45,8 +45,8 @@ if [ "$DISABLEEXTBANSTACKING" = "1" ]; then
 	ARG="$ARG--with-disable-extendedban-stacking ";
 fi
 fi
-if [ "$NOSPOOF" = "1" ] ; then
-ARG="$ARG--enable-nospoof "
+if [ "$NOSPOOF" != "1" ] ; then
+ARG="$ARG--disable-nospoof "
 fi
 if [  "$CRYPTOIRCD" = "1" ] ; then
 if test x"$SSLDIR" = "x" ; then