diff --git a/packages/mui-material/src/Modal/ModalManager.test.ts b/packages/mui-material/src/Modal/ModalManager.test.ts
index f48ce79546adda..bba004c0188dc2 100644
--- a/packages/mui-material/src/Modal/ModalManager.test.ts
+++ b/packages/mui-material/src/Modal/ModalManager.test.ts
@@ -129,18 +129,18 @@ describe('ModalManager', () => {
     });
 
     it('should handle the scroll', () => {
-      fixedNode.style.paddingRight = '14px';
+      fixedNode.style.paddingRight = '14.4px';
 
       const modal = getDummyModal();
       modalManager.add(modal, container1);
       modalManager.mount(modal, {});
       expect(container1.style.overflow).to.equal('hidden');
       expect(container1.style.paddingRight).to.equal(`${20 + getScrollbarSize(window)}px`);
-      expect(fixedNode.style.paddingRight).to.equal(`${14 + getScrollbarSize(window)}px`);
+      expect(fixedNode.style.paddingRight).to.equal(`${14.4 + getScrollbarSize(window)}px`);
       modalManager.remove(modal);
       expect(container1.style.overflow).to.equal('');
       expect(container1.style.paddingRight).to.equal('20px');
-      expect(fixedNode.style.paddingRight).to.equal('14px');
+      expect(fixedNode.style.paddingRight).to.equal('14.4px');
     });
 
     it('should disable the scroll even when not overflowing', () => {
diff --git a/packages/mui-material/src/Modal/ModalManager.ts b/packages/mui-material/src/Modal/ModalManager.ts
index 35ad16a9fd18c9..5ef338e470ff10 100644
--- a/packages/mui-material/src/Modal/ModalManager.ts
+++ b/packages/mui-material/src/Modal/ModalManager.ts
@@ -26,7 +26,7 @@ export function ariaHidden(element: Element, hide: boolean): void {
 }
 
 function getPaddingRight(element: Element): number {
-  return parseInt(ownerWindow(element).getComputedStyle(element).paddingRight, 10) || 0;
+  return parseFloat(ownerWindow(element).getComputedStyle(element).paddingRight) || 0;
 }
 
 function isAriaHiddenForbiddenOnElement(element: Element): boolean {