diff --git a/packages/block-editor/src/components/child-layout-control/index.js b/packages/block-editor/src/components/child-layout-control/index.js
index 20791d9751bcd4..861560efe1e1fd 100644
--- a/packages/block-editor/src/components/child-layout-control/index.js
+++ b/packages/block-editor/src/components/child-layout-control/index.js
@@ -187,6 +187,7 @@ function FlexControls( {
 							flexSize: value,
 						} );
 					} }
+					shouldPreserveUnit
 					value={ flexSize }
 					label={ flexResetLabel }
 					hideLabelFromVision
diff --git a/packages/block-editor/src/components/spacing-sizes-control/input-controls/spacing-input-control.js b/packages/block-editor/src/components/spacing-sizes-control/input-controls/spacing-input-control.js
index f03af41bfbc00d..b2970db16adc79 100644
--- a/packages/block-editor/src/components/spacing-sizes-control/input-controls/spacing-input-control.js
+++ b/packages/block-editor/src/components/spacing-sizes-control/input-controls/spacing-input-control.js
@@ -234,6 +234,7 @@ export default function SpacingInputControl( {
 						hideLabelFromVision
 						className="spacing-sizes-control__custom-value-input"
 						size="__unstable-large"
+						shouldPreserveUnit
 						onDragStart={ () => {
 							if ( value?.charAt( 0 ) === '-' ) {
 								setMinValue( 0 );