diff --git a/packages/block-editor/CHANGELOG.md b/packages/block-editor/CHANGELOG.md
index 17a8fcb5b872c..8990d18720462 100644
--- a/packages/block-editor/CHANGELOG.md
+++ b/packages/block-editor/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## Unreleased
 
+### Bug Fix
+
+-   `SpacingSizesControl`: fix white dot on thumb ([#48574](https://github.com/WordPress/gutenberg/pull/48574)).
+
 ## 11.4.0 (2023-02-15)
 
 ### Bug Fix
diff --git a/packages/block-editor/src/components/spacing-sizes-control/style.scss b/packages/block-editor/src/components/spacing-sizes-control/style.scss
index 4b60a744bfd90..2019b6d34d275 100644
--- a/packages/block-editor/src/components/spacing-sizes-control/style.scss
+++ b/packages/block-editor/src/components/spacing-sizes-control/style.scss
@@ -126,7 +126,7 @@
 		}
 	}
 
-	[class*="ThumbWrapper-thumbColor"] {
+	.components-range-control__thumb-wrapper {
 		z-index: 3;
 	}
 
diff --git a/packages/components/src/range-control/index.tsx b/packages/components/src/range-control/index.tsx
index cec69ac1dfa69..0d57dd8d235c2 100644
--- a/packages/components/src/range-control/index.tsx
+++ b/packages/components/src/range-control/index.tsx
@@ -269,7 +269,11 @@ function UnforwardedRangeControl< IconProps = unknown >(
 						style={ { width: fillValueOffset } }
 						trackColor={ trackColor }
 					/>
-					<ThumbWrapper style={ offsetStyle } disabled={ disabled }>
+					<ThumbWrapper
+						className="components-range-control__thumb-wrapper"
+						style={ offsetStyle }
+						disabled={ disabled }
+					>
 						<Thumb
 							aria-hidden={ true }
 							isFocused={ isThumbFocused }