diff --git a/Shorewall/Samples/Universal/shorewall.conf b/Shorewall/Samples/Universal/shorewall.conf
index 9f2f7cf5c..267a40f3e 100644
--- a/Shorewall/Samples/Universal/shorewall.conf
+++ b/Shorewall/Samples/Universal/shorewall.conf
@@ -114,6 +114,8 @@ ADD_SNAT_ALIASES=No
 
 ADMINISABSENTMINDED=Yes
 
+ALLOWUNKNOWNVARIABLES=No
+
 AUTOCOMMENT=Yes
 
 AUTOHELPERS=Yes
diff --git a/Shorewall/Samples/one-interface/shorewall.conf b/Shorewall/Samples/one-interface/shorewall.conf
index d6e718e0b..852fb2646 100644
--- a/Shorewall/Samples/one-interface/shorewall.conf
+++ b/Shorewall/Samples/one-interface/shorewall.conf
@@ -125,6 +125,8 @@ ADD_SNAT_ALIASES=No
 
 ADMINISABSENTMINDED=Yes
 
+ALLOWUNKNOWNVARIABLES=No
+
 AUTOCOMMENT=Yes
 
 AUTOHELPERS=Yes
diff --git a/Shorewall/Samples/three-interfaces/shorewall.conf b/Shorewall/Samples/three-interfaces/shorewall.conf
index c0f6c8fff..ac8f05232 100644
--- a/Shorewall/Samples/three-interfaces/shorewall.conf
+++ b/Shorewall/Samples/three-interfaces/shorewall.conf
@@ -123,6 +123,8 @@ ADD_SNAT_ALIASES=No
 
 ADMINISABSENTMINDED=Yes
 
+ALLOWUNKNOWNVARIABLES=No
+
 AUTOCOMMENT=Yes
 
 AUTOHELPERS=Yes
diff --git a/Shorewall/Samples/two-interfaces/shorewall.conf b/Shorewall/Samples/two-interfaces/shorewall.conf
index ea3416b59..258c879ec 100644
--- a/Shorewall/Samples/two-interfaces/shorewall.conf
+++ b/Shorewall/Samples/two-interfaces/shorewall.conf
@@ -126,6 +126,8 @@ ADD_SNAT_ALIASES=No
 
 ADMINISABSENTMINDED=Yes
 
+ALLOWUNKNOWNVARIABLES=No
+
 AUTOCOMMENT=Yes
 
 AUTOHELPERS=Yes
diff --git a/Shorewall/configfiles/shorewall.conf b/Shorewall/configfiles/shorewall.conf
index d159ea98f..70650be67 100644
--- a/Shorewall/configfiles/shorewall.conf
+++ b/Shorewall/configfiles/shorewall.conf
@@ -114,6 +114,8 @@ ADD_SNAT_ALIASES=No
 
 ADMINISABSENTMINDED=Yes
 
+ALLOWUNKNOWNVARIABLES=No
+
 AUTOCOMMENT=Yes
 
 AUTOHELPERS=Yes
diff --git a/Shorewall6/Samples6/Universal/shorewall6.conf b/Shorewall6/Samples6/Universal/shorewall6.conf
index 63c3c8d87..bb4c6df85 100644
--- a/Shorewall6/Samples6/Universal/shorewall6.conf
+++ b/Shorewall6/Samples6/Universal/shorewall6.conf
@@ -109,6 +109,8 @@ ACCOUNTING_TABLE=filter
 
 ADMINISABSENTMINDED=Yes
 
+ALLOWUNKNOWNVARIABLES=No
+
 AUTOCOMMENT=Yes
 
 AUTOHELPERS=Yes
diff --git a/Shorewall6/Samples6/one-interface/shorewall6.conf b/Shorewall6/Samples6/one-interface/shorewall6.conf
index 68922aabf..08010c858 100644
--- a/Shorewall6/Samples6/one-interface/shorewall6.conf
+++ b/Shorewall6/Samples6/one-interface/shorewall6.conf
@@ -109,6 +109,8 @@ ACCOUNTING_TABLE=filter
 
 ADMINISABSENTMINDED=Yes
 
+ALLOWUNKNOWNVARIABLES=No
+
 AUTOCOMMENT=Yes
 
 AUTOHELPERS=Yes
diff --git a/Shorewall6/Samples6/three-interfaces/shorewall6.conf b/Shorewall6/Samples6/three-interfaces/shorewall6.conf
index 912b9af28..8f06bfc82 100644
--- a/Shorewall6/Samples6/three-interfaces/shorewall6.conf
+++ b/Shorewall6/Samples6/three-interfaces/shorewall6.conf
@@ -109,6 +109,8 @@ ACCOUNTING_TABLE=filter
 
 ADMINISABSENTMINDED=Yes
 
+ALLOWUNKNOWNVARIABLES=No
+
 AUTOCOMMENT=Yes
 
 AUTOHELPERS=Yes
diff --git a/Shorewall6/Samples6/two-interfaces/shorewall6.conf b/Shorewall6/Samples6/two-interfaces/shorewall6.conf
index 86c3e7f65..b35798c39 100644
--- a/Shorewall6/Samples6/two-interfaces/shorewall6.conf
+++ b/Shorewall6/Samples6/two-interfaces/shorewall6.conf
@@ -109,6 +109,8 @@ ACCOUNTING_TABLE=filter
 
 ADMINISABSENTMINDED=Yes
 
+ALLOWUNKNOWNVARIABLES=No
+
 AUTOCOMMENT=Yes
 
 AUTOHELPERS=Yes
diff --git a/Shorewall6/configfiles/shorewall6.conf b/Shorewall6/configfiles/shorewall6.conf
index e31a52ecf..47f29ac08 100644
--- a/Shorewall6/configfiles/shorewall6.conf
+++ b/Shorewall6/configfiles/shorewall6.conf
@@ -109,6 +109,8 @@ ACCOUNTING_TABLE=filter
 
 ADMINISABSENTMINDED=Yes
 
+ALLOWUNKNOWNVARIABLES=No
+
 AUTOCOMMENT=Yes
 
 AUTOHELPERS=Yes