diff --git a/.changeset/quiet-dragons-lay.md b/.changeset/quiet-dragons-lay.md
new file mode 100644
index 00000000..33aa11c2
--- /dev/null
+++ b/.changeset/quiet-dragons-lay.md
@@ -0,0 +1,5 @@
+---
+"preact-render-to-string": major
+---
+
+fix: escape a single quote
diff --git a/src/util.js b/src/util.js
index bc80ea48..42ddff0a 100644
--- a/src/util.js
+++ b/src/util.js
@@ -5,7 +5,7 @@ export const HTML_LOWER_CASE = /^accessK|^auto[A-Z]|^ch|^col|cont|cross|dateT|en
 export const SVG_CAMEL_CASE = /^ac|^ali|arabic|basel|cap|clipPath$|clipRule$|color|dominant|enable|fill|flood|font|glyph[^R]|horiz|image|letter|lighting|marker[^WUH]|overline|panose|pointe|paint|rendering|shape|stop|strikethrough|stroke|text[^L]|transform|underline|unicode|units|^v[^i]|^w|^xH/;
 
 // DOM properties that should NOT have "px" added when numeric
-const ENCODED_ENTITIES = /["&<]/;
+const ENCODED_ENTITIES = /["'&<]/;
 
 /** @param {string} str */
 export function encodeEntities(str) {
@@ -26,6 +26,9 @@ export function encodeEntities(str) {
 			case 38:
 				ch = '&amp;';
 				break;
+			case 39:
+				ch = '&#x27;';
+				break;
 			case 60:
 				ch = '&lt;';
 				break;
diff --git a/test/render.test.js b/test/render.test.js
index e6b6fe1c..050b6388 100644
--- a/test/render.test.js
+++ b/test/render.test.js
@@ -213,8 +213,8 @@ describe('render', () => {
 		});
 
 		it('should encode entities', () => {
-			let rendered = render(<div a={'"<>&'}>{'"<>&'}</div>),
-				expected = `<div a="&quot;&lt;>&amp;">&quot;&lt;>&amp;</div>`;
+			let rendered = render(<div a={'"\'<>&'}>{'"\'<>&'}</div>),
+				expected = `<div a="&quot;&#x27;&lt;>&amp;">&quot;&#x27;&lt;>&amp;</div>`;
 
 			expect(rendered).to.equal(expected);
 		});