diff --git a/src/vs/workbench/browser/parts/editor/sideBySideEditor.ts b/src/vs/workbench/browser/parts/editor/sideBySideEditor.ts
index a2d1384301beb..1de1c423924d7 100644
--- a/src/vs/workbench/browser/parts/editor/sideBySideEditor.ts
+++ b/src/vs/workbench/browser/parts/editor/sideBySideEditor.ts
@@ -25,7 +25,7 @@ import { IEditorOptions } from 'vs/platform/editor/common/editor';
 import { IConfigurationChangeEvent, IConfigurationService } from 'vs/platform/configuration/common/configuration';
 import { DEFAULT_EDITOR_MIN_DIMENSIONS } from 'vs/workbench/browser/parts/editor/editor';
 import { DisposableStore } from 'vs/base/common/lifecycle';
-import { SIDE_BY_SIDE_EDITOR_BORDER } from 'vs/workbench/common/theme';
+import { SIDE_BY_SIDE_EDITOR_HORIZONTAL_BORDER, SIDE_BY_SIDE_EDITOR_VERTICAL_BORDER } from 'vs/workbench/common/theme';
 import { AbstractEditorWithViewState } from 'vs/workbench/browser/parts/editor/editorWithViewState';
 import { ITextResourceConfigurationService } from 'vs/editor/common/services/textResourceConfigurationService';
 import { IEditorService } from 'vs/workbench/services/editor/common/editorService';
@@ -433,13 +433,13 @@ export class SideBySideEditor extends AbstractEditorWithViewState<ISideBySideEdi
 			if (this.orientation === Orientation.HORIZONTAL) {
 				this.primaryEditorContainer.style.borderLeftWidth = '1px';
 				this.primaryEditorContainer.style.borderLeftStyle = 'solid';
-				this.primaryEditorContainer.style.borderLeftColor = this.getColor(SIDE_BY_SIDE_EDITOR_BORDER)?.toString() ?? '';
+				this.primaryEditorContainer.style.borderLeftColor = this.getColor(SIDE_BY_SIDE_EDITOR_VERTICAL_BORDER)?.toString() ?? '';
 
 				this.primaryEditorContainer.style.borderTopWidth = '0';
 			} else {
 				this.primaryEditorContainer.style.borderTopWidth = '1px';
 				this.primaryEditorContainer.style.borderTopStyle = 'solid';
-				this.primaryEditorContainer.style.borderTopColor = this.getColor(SIDE_BY_SIDE_EDITOR_BORDER)?.toString() ?? '';
+				this.primaryEditorContainer.style.borderTopColor = this.getColor(SIDE_BY_SIDE_EDITOR_HORIZONTAL_BORDER)?.toString() ?? '';
 
 				this.primaryEditorContainer.style.borderLeftWidth = '0';
 			}
diff --git a/src/vs/workbench/common/theme.ts b/src/vs/workbench/common/theme.ts
index d24375ccb54c3..c0ff64417db98 100644
--- a/src/vs/workbench/common/theme.ts
+++ b/src/vs/workbench/common/theme.ts
@@ -243,11 +243,17 @@ export const EDITOR_DRAG_AND_DROP_BACKGROUND = registerColor('editorGroup.dropBa
 	hc: null
 }, localize('editorDragAndDropBackground', "Background color when dragging editors around. The color should have transparency so that the editor contents can still shine through."));
 
-export const SIDE_BY_SIDE_EDITOR_BORDER = registerColor('sideBySideEditor.border', {
+export const SIDE_BY_SIDE_EDITOR_HORIZONTAL_BORDER = registerColor('sideBySideEditor.horizontalBorder', {
 	dark: EDITOR_GROUP_BORDER,
 	light: EDITOR_GROUP_BORDER,
 	hc: EDITOR_GROUP_BORDER
-}, localize('sideBySideEditor.border', "Color to separate two editors from each other when shown side by side in an editor group."));
+}, localize('sideBySideEditor.horizontalBorder', "Color to separate two editors from each other when shown side by side in an editor group from top to bottom."));
+
+export const SIDE_BY_SIDE_EDITOR_VERTICAL_BORDER = registerColor('sideBySideEditor.verticalBorder', {
+	dark: EDITOR_GROUP_BORDER,
+	light: EDITOR_GROUP_BORDER,
+	hc: EDITOR_GROUP_BORDER
+}, localize('sideBySideEditor.verticalBorder', "Color to separate two editors from each other when shown side by side in an editor group from left to right."));
 
 // < --- Panels --- >