diff --git a/.changeset/2026-08-17-fix-blockquote-unset-text-style.md b/.changeset/2026-08-17-fix-blockquote-unset-text-style.md
new file mode 100644
index 0000000000..ff86af042b
--- /dev/null
+++ b/.changeset/2026-08-17-fix-blockquote-unset-text-style.md
@@ -0,0 +1,5 @@
+---
+'@tiptap/extension-text-style': patch
+---
+
+Unsetting one text style inside a blockquote no longer removes the other text styles in it.
diff --git a/packages/extension-text-style/__tests__/font-size-commands.spec.ts b/packages/extension-text-style/__tests__/font-size-commands.spec.ts
index e4c6b00e97..713401a7f0 100644
--- a/packages/extension-text-style/__tests__/font-size-commands.spec.ts
+++ b/packages/extension-text-style/__tests__/font-size-commands.spec.ts
@@ -1,8 +1,9 @@
 import { Editor } from '@tiptap/core'
+import Blockquote from '@tiptap/extension-blockquote'
 import Document from '@tiptap/extension-document'
 import Paragraph from '@tiptap/extension-paragraph'
 import Text from '@tiptap/extension-text'
-import { FontSize, TextStyle } from '@tiptap/extension-text-style'
+import { Color, FontSize, TextStyle } from '@tiptap/extension-text-style'
 import { afterEach, beforeEach, describe, expect, it } from 'vitest'
 
 describe('FontSize commands', () => {
@@ -40,3 +41,43 @@ describe('FontSize commands', () => {
     expect(editor.getHTML()).not.toContain('<span')
   })
 })
+
+describe('FontSize commands inside a wrapper node', () => {
+  let editor: Editor
+
+  const editorWith = (content: string) => {
+    const element = document.createElement('div')
+    document.body.appendChild(element)
+    editor = new Editor({
+      element,
+      extensions: [Document, Paragraph, Text, Blockquote, TextStyle, Color, FontSize],
+      content,
+    })
+    editor.commands.selectAll()
+    return editor
+  }
+
+  afterEach(() => {
+    editor.destroy()
+  })
+
+  it('keeps the other text styles when unsetting inside a blockquote', () => {
+    editorWith(
+      '<blockquote><p><span style="color: #ff0000; font-size: 28px">Example Text</span></p></blockquote>',
+    )
+
+    editor.commands.unsetFontSize()
+
+    expect(editor.getHTML()).toContain('color: #ff0000')
+    expect(editor.getHTML()).not.toContain('font-size')
+  })
+
+  it('keeps the other text styles when unsetting inside a paragraph', () => {
+    editorWith('<p><span style="color: #ff0000; font-size: 28px">Example Text</span></p>')
+
+    editor.commands.unsetFontSize()
+
+    expect(editor.getHTML()).toContain('color: #ff0000')
+    expect(editor.getHTML()).not.toContain('font-size')
+  })
+})
diff --git a/packages/extension-text-style/src/text-style/index.ts b/packages/extension-text-style/src/text-style/index.ts
index ec6334eeb8..2481901588 100644
--- a/packages/extension-text-style/src/text-style/index.ts
+++ b/packages/extension-text-style/src/text-style/index.ts
@@ -144,9 +144,8 @@ export const TextStyle = Mark.create<TextStyleOptions>({
           // removes everything from all the nodes
           // within the selection range.
           tr.doc.nodesBetween(selection.from, selection.to, (node, pos) => {
-            // Check if it's a paragraph element, if so, skip this node as we apply
-            // the text style to inline text nodes only (span).
-            if (node.isTextblock) {
+            // Skip non-inline nodes, the text style only applies to spans
+            if (!node.isInline) {
               return true
             }