diff --git a/.changeset/few-geckos-brush.md b/.changeset/few-geckos-brush.md
new file mode 100644
index 000000000..d0643beb7
--- /dev/null
+++ b/.changeset/few-geckos-brush.md
@@ -0,0 +1,5 @@
+---
+"@tiptap/extension-heading": patch
+---
+
+Fixed a bug causing the levels rule to be ignored if a level of 1 was **not allowed**
diff --git a/packages/extension-heading/src/heading.ts b/packages/extension-heading/src/heading.ts
index ff417a304..61c88e5a2 100644
--- a/packages/extension-heading/src/heading.ts
+++ b/packages/extension-heading/src/heading.ts
@@ -117,7 +117,7 @@ export const Heading = Node.create<HeadingOptions>({
   addInputRules() {
     return this.options.levels.map(level => {
       return textblockTypeInputRule({
-        find: new RegExp(`^(#{1,${level}})\\s$`),
+        find: new RegExp(`^(#{${Math.min(...this.options.levels)},${level}})\\s$`),
         type: this.type,
         getAttributes: {
           level,