diff --git a/lib/rules/filename-blocklist.js b/lib/rules/filename-blocklist.js
index ed8165c..9b41044 100644
--- a/lib/rules/filename-blocklist.js
+++ b/lib/rules/filename-blocklist.js
@@ -38,6 +38,7 @@ export default {
       },
       {
         type: 'object',
+        additionalProperties: false,
         properties: {
           errorMessage: { type: 'string' },
         },
diff --git a/lib/rules/filename-naming-convention.js b/lib/rules/filename-naming-convention.js
index fd47819..7a2c1d3 100644
--- a/lib/rules/filename-naming-convention.js
+++ b/lib/rules/filename-naming-convention.js
@@ -44,6 +44,7 @@ export default {
       },
       {
         type: 'object',
+        additionalProperties: false,
         properties: {
           ignoreMiddleExtensions: { type: 'boolean' },
           errorMessage: { type: 'string' },
diff --git a/lib/rules/folder-match-with-fex.js b/lib/rules/folder-match-with-fex.js
index a45a056..ea7c8b8 100644
--- a/lib/rules/folder-match-with-fex.js
+++ b/lib/rules/folder-match-with-fex.js
@@ -39,6 +39,7 @@ export default {
       },
       {
         type: 'object',
+        additionalProperties: false,
         properties: {
           errorMessage: { type: 'string' },
         },
diff --git a/lib/rules/folder-naming-convention.js b/lib/rules/folder-naming-convention.js
index dcc845d..f558d69 100644
--- a/lib/rules/folder-naming-convention.js
+++ b/lib/rules/folder-naming-convention.js
@@ -46,6 +46,7 @@ export default {
       },
       {
         type: 'object',
+        additionalProperties: false,
         properties: {
           errorMessage: { type: 'string' },
           ignoreWords: {
diff --git a/lib/rules/no-index.js b/lib/rules/no-index.js
index 6ab13cb..888a9c0 100644
--- a/lib/rules/no-index.js
+++ b/lib/rules/no-index.js
@@ -24,6 +24,7 @@ export default {
     schema: [
       {
         type: 'object',
+        additionalProperties: false,
         properties: {
           ignoreMiddleExtensions: { type: 'boolean' },
           errorMessage: { type: 'string' },