diff --git a/types/simplemde/index.d.ts b/types/simplemde/index.d.ts
index c78d4fb408..693e4a2ca2 100644
--- a/types/simplemde/index.d.ts
+++ b/types/simplemde/index.d.ts
@@ -35,7 +35,7 @@ declare namespace SimpleMDE {
     }
 
     interface ShortcutsArray {
-        [action: string]: string;
+        [action: string]: string|undefined;
         toggleBlockquote?: string;
         toggleBold?: string;
         cleanBlock?: string;
diff --git a/types/simplemde/simplemde-tests.ts b/types/simplemde/simplemde-tests.ts
index e9be36b7cb..313b3c80d4 100644
--- a/types/simplemde/simplemde-tests.ts
+++ b/types/simplemde/simplemde-tests.ts
@@ -57,7 +57,8 @@ function testSimplemde() {
                 codeSyntaxHighlighting: true
             },
             shortcuts: {
-                drawTable: "Cmd-Alt-T"
+                drawTable: "Cmd-Alt-T",
+                toggleCodeBlock: null
             },
             showIcons: ["code", "table"],
             spellChecker: false,