diff --git a/test/sort-intersection-types.test.ts b/test/sort-intersection-types.test.ts
index 84d419ec1..85d26632c 100644
--- a/test/sort-intersection-types.test.ts
+++ b/test/sort-intersection-types.test.ts
@@ -1439,5 +1439,19 @@ describe(ruleName, () => {
         ],
       },
     )
+
+    ruleTester.run(`${ruleName}: should ignore whitespaces`, rule, {
+      valid: [
+        {
+          code: dedent`
+            type T =
+            { a: string } &
+            {  b: string }
+          `,
+          options: [{}],
+        },
+      ],
+      invalid: [],
+    })
   })
 })
diff --git a/test/sort-union-types.test.ts b/test/sort-union-types.test.ts
index 73c808e2c..7bb4541ab 100644
--- a/test/sort-union-types.test.ts
+++ b/test/sort-union-types.test.ts
@@ -1471,5 +1471,19 @@ describe(ruleName, () => {
         ],
       },
     )
+
+    ruleTester.run(`${ruleName}: should ignore whitespaces`, rule, {
+      valid: [
+        {
+          code: dedent`
+            type T =
+            { a: string } |
+            {  b: string }
+          `,
+          options: [{}],
+        },
+      ],
+      invalid: [],
+    })
   })
 })
diff --git a/utils/compare.ts b/utils/compare.ts
index 664815a05..fd00f1642 100644
--- a/utils/compare.ts
+++ b/utils/compare.ts
@@ -37,16 +37,11 @@ export let compare = (
 ): number => {
   let orderCoefficient = options.order === 'asc' ? 1 : -1
   let sortingFunction: (a: SortingNode, b: SortingNode) => number
-
-  let formatString =
-    options.type === 'line-length' || !options.ignoreCase
-      ? (string: string) => string
-      : (string: string) => string.toLowerCase()
-
   let nodeValueGetter =
     options.nodeValueGetter ?? ((node: SortingNode) => node.name)
 
   if (options.type === 'alphabetical') {
+    let formatString = getFormatStringFunc(!!options.ignoreCase)
     sortingFunction = (aNode, bNode) =>
       formatString(nodeValueGetter(aNode)).localeCompare(
         formatString(nodeValueGetter(bNode)),
@@ -59,11 +54,13 @@ export let compare = (
       }
       return string
     }
-    sortingFunction = (aNode, bNode) =>
-      naturalCompare(
+    sortingFunction = (aNode, bNode) => {
+      let formatString = getFormatStringFunc(!!options.ignoreCase)
+      return naturalCompare(
         prepareNumeric(formatString(nodeValueGetter(aNode))),
         prepareNumeric(formatString(nodeValueGetter(bNode))),
       )
+    }
   } else {
     sortingFunction = (aNode, bNode) => {
       let aSize = aNode.size
@@ -90,3 +87,11 @@ export let compare = (
 
   return orderCoefficient * sortingFunction(a, b)
 }
+
+let getFormatStringFunc = (ignoreCase: boolean) => (value: string) => {
+  let valueToCompare = value
+  if (ignoreCase) {
+    valueToCompare = valueToCompare.toLowerCase()
+  }
+  return valueToCompare.replaceAll(/\s/g, '')
+}