diff --git a/dev/lib/syntax.js b/dev/lib/syntax.js
index ba0b534..1215c05 100644
--- a/dev/lib/syntax.js
+++ b/dev/lib/syntax.js
@@ -36,14 +36,19 @@ export function gfmFootnote() {
   return {
     document: {
       [codes.leftSquareBracket]: {
+        name: 'footnoteDefinition',
         tokenize: tokenizeDefinitionStart,
         continuation: {tokenize: tokenizeDefinitionContinuation},
         exit: gfmFootnoteDefinitionEnd
       }
     },
     text: {
-      [codes.leftSquareBracket]: {tokenize: tokenizeGfmFootnoteCall},
+      [codes.leftSquareBracket]: {
+        name: 'footnoteCall',
+        tokenize: tokenizeGfmFootnoteCall
+      },
       [codes.rightSquareBracket]: {
+        name: 'potentialFootnoteCall',
         add: 'after',
         tokenize: tokenizePotentialGfmFootnoteCall,
         resolveTo: resolveToPotentialGfmFootnoteCall
diff --git a/test/index.js b/test/index.js
index e8bd2d4..360eacc 100644
--- a/test/index.js
+++ b/test/index.js
@@ -46,6 +46,30 @@ test('micromark-extension-gfm-footnote', async function (t) {
     )
   })
 
+  await t.test(
+    'should skip calls and definitions  construct if `disable.null` includes `footnoteDefinition` and `footnoteCall`',
+    async function () {
+      assert.deepEqual(
+        micromark('A call.[^a]\n\n[^a]: whatevs', {
+          extensions: [
+            gfmFootnote(),
+            {
+              disable: {
+                null: [
+                  'footnoteDefinition',
+                  'footnoteCall',
+                  'potentialFootnoteCall'
+                ]
+              }
+            }
+          ],
+          htmlExtensions: [gfmFootnoteHtml()]
+        }),
+        '<p>A call.<a href="whatevs">^a</a></p>\n'
+      )
+    }
+  )
+
   await t.test(
     'should support `options.label`, `options.backLabel`',
     async function () {