diff --git a/packages/preset-mini/src/preflights.ts b/packages/preset-mini/src/preflights.ts
index 38b782f998..c05efde127 100644
--- a/packages/preset-mini/src/preflights.ts
+++ b/packages/preset-mini/src/preflights.ts
@@ -8,10 +8,7 @@ export const preflights: Preflight[] = [
     getCSS(ctx: PreflightContext<Theme>) {
       if (ctx.theme.preflightBase) {
         const css = entriesToCss(Object.entries(ctx.theme.preflightBase))
-        let roots = toArray(ctx.theme.preflightRoot ?? [])
-        if (!roots.length)
-          roots = ['*,::before,::after', '::backdrop']
-
+        const roots = toArray(ctx.theme.preflightRoot ?? ['*,::before,::after', '::backdrop'])
         return roots.map(root => `${root}{${css}}`).join('')
       }
     },
diff --git a/test/__snapshots__/preflights.test.ts.snap b/test/__snapshots__/preflights.test.ts.snap
index 4692908eb2..76c6f1f04c 100644
--- a/test/__snapshots__/preflights.test.ts.snap
+++ b/test/__snapshots__/preflights.test.ts.snap
@@ -7,12 +7,12 @@ exports[`preflights > basic 1`] = `
 .hello { text: red }"
 `;
 
-exports[`preflights > preflight root can be customized 1`] = `
+exports[`preflights > preflight root can be customized with array 1`] = `
 "/* layer: preflights */
-:root{--un-rotate:0;--un-rotate-x:0;--un-rotate-y:0;--un-rotate-z:0;--un-scale-x:1;--un-scale-y:1;--un-scale-z:1;--un-skew-x:0;--un-skew-y:0;--un-translate-x:0;--un-translate-y:0;--un-translate-z:0;--un-ring-offset-shadow:0 0 rgba(0,0,0,0);--un-ring-shadow:0 0 rgba(0,0,0,0);--un-shadow-inset: ;--un-shadow:0 0 rgba(0,0,0,0);--un-ring-inset: ;--un-ring-offset-width:0px;--un-ring-offset-color:#fff;--un-ring-width:0px;--un-ring-color:rgba(147,197,253,0.5);}"
+.scope-1{--un-rotate:0;--un-rotate-x:0;--un-rotate-y:0;--un-rotate-z:0;--un-scale-x:1;--un-scale-y:1;--un-scale-z:1;--un-skew-x:0;--un-skew-y:0;--un-translate-x:0;--un-translate-y:0;--un-translate-z:0;--un-ring-offset-shadow:0 0 rgba(0,0,0,0);--un-ring-shadow:0 0 rgba(0,0,0,0);--un-shadow-inset: ;--un-shadow:0 0 rgba(0,0,0,0);--un-ring-inset: ;--un-ring-offset-width:0px;--un-ring-offset-color:#fff;--un-ring-width:0px;--un-ring-color:rgba(147,197,253,0.5);}[data-scope-2]{--un-rotate:0;--un-rotate-x:0;--un-rotate-y:0;--un-rotate-z:0;--un-scale-x:1;--un-scale-y:1;--un-scale-z:1;--un-skew-x:0;--un-skew-y:0;--un-translate-x:0;--un-translate-y:0;--un-translate-z:0;--un-ring-offset-shadow:0 0 rgba(0,0,0,0);--un-ring-shadow:0 0 rgba(0,0,0,0);--un-shadow-inset: ;--un-shadow:0 0 rgba(0,0,0,0);--un-ring-inset: ;--un-ring-offset-width:0px;--un-ring-offset-color:#fff;--un-ring-width:0px;--un-ring-color:rgba(147,197,253,0.5);}"
 `;
 
-exports[`preflights > preflight root can be customized 2`] = `
+exports[`preflights > preflight root can be customized with string 1`] = `
 "/* layer: preflights */
-.scope-1{--un-rotate:0;--un-rotate-x:0;--un-rotate-y:0;--un-rotate-z:0;--un-scale-x:1;--un-scale-y:1;--un-scale-z:1;--un-skew-x:0;--un-skew-y:0;--un-translate-x:0;--un-translate-y:0;--un-translate-z:0;--un-ring-offset-shadow:0 0 rgba(0,0,0,0);--un-ring-shadow:0 0 rgba(0,0,0,0);--un-shadow-inset: ;--un-shadow:0 0 rgba(0,0,0,0);--un-ring-inset: ;--un-ring-offset-width:0px;--un-ring-offset-color:#fff;--un-ring-width:0px;--un-ring-color:rgba(147,197,253,0.5);}[data-scope-2]{--un-rotate:0;--un-rotate-x:0;--un-rotate-y:0;--un-rotate-z:0;--un-scale-x:1;--un-scale-y:1;--un-scale-z:1;--un-skew-x:0;--un-skew-y:0;--un-translate-x:0;--un-translate-y:0;--un-translate-z:0;--un-ring-offset-shadow:0 0 rgba(0,0,0,0);--un-ring-shadow:0 0 rgba(0,0,0,0);--un-shadow-inset: ;--un-shadow:0 0 rgba(0,0,0,0);--un-ring-inset: ;--un-ring-offset-width:0px;--un-ring-offset-color:#fff;--un-ring-width:0px;--un-ring-color:rgba(147,197,253,0.5);}"
+:root{--un-rotate:0;--un-rotate-x:0;--un-rotate-y:0;--un-rotate-z:0;--un-scale-x:1;--un-scale-y:1;--un-scale-z:1;--un-skew-x:0;--un-skew-y:0;--un-translate-x:0;--un-translate-y:0;--un-translate-z:0;--un-ring-offset-shadow:0 0 rgba(0,0,0,0);--un-ring-shadow:0 0 rgba(0,0,0,0);--un-shadow-inset: ;--un-shadow:0 0 rgba(0,0,0,0);--un-ring-inset: ;--un-ring-offset-width:0px;--un-ring-offset-color:#fff;--un-ring-width:0px;--un-ring-color:rgba(147,197,253,0.5);}"
 `;
diff --git a/test/preflights.test.ts b/test/preflights.test.ts
index 82f31790fb..2e826250e4 100644
--- a/test/preflights.test.ts
+++ b/test/preflights.test.ts
@@ -45,7 +45,7 @@ describe('preflights', () => {
     `)
   })
 
-  test('preflight root can be customized', async () => {
+  test('preflight root can be customized with string', async () => {
     const uno = createGenerator({
       presets: [
         presetMini(),
@@ -58,7 +58,7 @@ describe('preflights', () => {
     expect(css).toMatchSnapshot()
   })
 
-  test('preflight root can be customized', async () => {
+  test('preflight root can be customized with array', async () => {
     const uno = createGenerator({
       presets: [
         presetMini(),
@@ -70,4 +70,17 @@ describe('preflights', () => {
     const { css } = await uno.generate('')
     expect(css).toMatchSnapshot()
   })
+
+  test('preflight root can be disabled using empty array', async () => {
+    const uno = createGenerator({
+      presets: [
+        presetMini(),
+      ],
+      theme: {
+        preflightRoot: [],
+      },
+    })
+    const { css } = await uno.generate('')
+    expect(css).eql('')
+  })
 })