diff --git a/packages/utils/package.json b/packages/utils/package.json
index 35603d7..ccafb47 100644
--- a/packages/utils/package.json
+++ b/packages/utils/package.json
@@ -3,7 +3,7 @@
 	"type": "module",
 	"description": "Common functions for working with Iconify icon sets used by various packages.",
 	"author": "Vjacheslav Trushkin",
-	"version": "1.0.25",
+	"version": "1.0.26",
 	"license": "MIT",
 	"bugs": "https://github.com/iconify/iconify/issues",
 	"homepage": "https://iconify.design/",
diff --git a/packages/utils/src/loader/utils.ts b/packages/utils/src/loader/utils.ts
index 77cbb63..4ad4a4c 100644
--- a/packages/utils/src/loader/utils.ts
+++ b/packages/utils/src/loader/utils.ts
@@ -70,17 +70,16 @@ export async function mergeIconProps(
 		}
 	}
 
-	svg = svg.replace(
-		'<svg ',
-		`<svg ${Object.keys(props)
-			.map((p) =>
-				(p === 'width' && widthOnSvg) || (p === 'height' && heightOnSvg)
-					? null
-					: `${p}="${props[p]}"`
-			)
-			.filter((p) => p != null)
-			.join(' ')} `
-	);
+	const propsToAdd = Object.keys(props)
+		.map((p) =>
+			(p === 'width' && widthOnSvg) || (p === 'height' && heightOnSvg)
+				? null
+				: `${p}="${props[p]}"`
+		)
+		.filter((p) => p != null);
+	if (propsToAdd.length) {
+		svg = svg.replace('<svg ', `<svg ${propsToAdd.join(' ')} `);
+	}
 
 	if (svg && options) {
 		const { defaultStyle, defaultClass } = options;
diff --git a/packages/utils/tests/get-custom-icon-test.ts b/packages/utils/tests/get-custom-icon-test.ts
index 3ee1248..27dae17 100644
--- a/packages/utils/tests/get-custom-icon-test.ts
+++ b/packages/utils/tests/get-custom-icon-test.ts
@@ -11,6 +11,17 @@ describe('Testing getCustomIcon', () => {
 		expect(svg).toEqual(result);
 	});
 
+	test('CustomIconLoader without xmlns', async () => {
+		const svg =
+			'<svg viewBox="0 0 120 120"><circle cx="60" cy="60" r="50"/></svg>';
+		const result = await getCustomIcon(() => svg, 'a', 'b', {
+			addXmlNs: true,
+		});
+		expect(result).toEqual(
+			'<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 120 120"><circle cx="60" cy="60" r="50"/></svg>'
+		);
+	});
+
 	test("CustomIconLoader with transform: scale/width/height shouldn't take effect", async () => {
 		const svg = await fs.readFile(fixturesDir + '/circle.svg', 'utf8');
 		const options: IconifyLoaderOptions = {