diff --git a/extensions/theme-abyss/themes/abyss-color-theme.json b/extensions/theme-abyss/themes/abyss-color-theme.json
index 0b568c23fad993f0984a0e160ecb2e52c5065c68..642a9e3d97b3ebd02c52d461ddce7243a8e40e6d 100644
--- a/extensions/theme-abyss/themes/abyss-color-theme.json
+++ b/extensions/theme-abyss/themes/abyss-color-theme.json
@@ -390,7 +390,7 @@
 		"tab.inactiveBackground": "#10192c",
 		// "tab.activeForeground": "",
 		// "tab.inactiveForeground": "",
-		"tab.lastPinnedBorder": "#596F99",
+		"tab.lastPinnedBorder": "#2b3c5d",
 
 		// Workbench: Activity Bar
 		"activityBar.background": "#051336",
diff --git a/extensions/theme-defaults/themes/light_defaults.json b/extensions/theme-defaults/themes/light_defaults.json
index cbf573c0e9d44c7f6cf6011b9acc0dacaf890861..0f82502db7dad3a9b0c8b674529069794b50aca2 100644
--- a/extensions/theme-defaults/themes/light_defaults.json
+++ b/extensions/theme-defaults/themes/light_defaults.json
@@ -20,7 +20,7 @@
 		"statusBarItem.remoteBackground": "#16825D",
 		"sideBarSectionHeader.background": "#0000",
 		"sideBarSectionHeader.border": "#61616130",
-		"tab.lastPinnedBorder": "#81818130",
+		"tab.lastPinnedBorder": "#61616130",
 		"notebook.focusedCellBackground": "#c8ddf150",
 		"notebook.cellBorderColor": "#dae3e9",
 		"notebook.outputContainerBackgroundColor": "#c8ddf150"
diff --git a/extensions/theme-kimbie-dark/themes/kimbie-dark-color-theme.json b/extensions/theme-kimbie-dark/themes/kimbie-dark-color-theme.json
index ed8a7572f9000f750a4dd827bc8baacbec235946..8997b80df556546f3512c2c6284d4d0f4255c7b9 100644
--- a/extensions/theme-kimbie-dark/themes/kimbie-dark-color-theme.json
+++ b/extensions/theme-kimbie-dark/themes/kimbie-dark-color-theme.json
@@ -23,7 +23,7 @@
 		"editorGroupHeader.tabsBackground": "#131510",
 		"editorLineNumber.activeForeground": "#adadad",
 		"tab.inactiveBackground": "#131510",
-		"tab.lastPinnedBorder": "#5e452b",
+		"tab.lastPinnedBorder": "#51412c",
 		"titleBar.activeBackground": "#423523",
 		"statusBar.background": "#423523",
 		"statusBar.debuggingBackground": "#423523",
diff --git a/extensions/theme-monokai/themes/monokai-color-theme.json b/extensions/theme-monokai/themes/monokai-color-theme.json
index 8a67e377734ae97b6db3048bd1eb2f5024bc9362..aa30b85b130584d52d0250947ddc9845a43bd82f 100644
--- a/extensions/theme-monokai/themes/monokai-color-theme.json
+++ b/extensions/theme-monokai/themes/monokai-color-theme.json
@@ -35,7 +35,7 @@
 		"tab.inactiveBackground": "#34352f",
 		"tab.border": "#1e1f1c",
 		"tab.inactiveForeground": "#ccccc7", // needs to be bright so it's readable when another editor group is focused
-		"tab.lastPinnedBorder": "#75715E",
+		"tab.lastPinnedBorder": "#414339",
 		"widget.shadow": "#000000",
 		"progressBar.background": "#75715E",
 		"badge.background": "#75715E",
diff --git a/extensions/theme-quietlight/themes/quietlight-color-theme.json b/extensions/theme-quietlight/themes/quietlight-color-theme.json
index 5c467a999d3ce5e79049663e89070dc29b04da1d..2a12b3698854c0e41b7688bf546a10583dc879a4 100644
--- a/extensions/theme-quietlight/themes/quietlight-color-theme.json
+++ b/extensions/theme-quietlight/themes/quietlight-color-theme.json
@@ -472,7 +472,7 @@
 		"peekViewResult.background": "#F2F8FC",
 		"peekView.border": "#705697",
 		"peekViewResult.matchHighlightBackground": "#93C6D6",
-		"tab.lastPinnedBorder": "#C9D0D988",
+		"tab.lastPinnedBorder": "#c9d0d9",
 		"statusBar.background": "#705697",
 		"statusBar.noFolderBackground": "#705697",
 		"statusBar.debuggingBackground": "#705697",
diff --git a/extensions/theme-solarized-light/themes/solarized-light-color-theme.json b/extensions/theme-solarized-light/themes/solarized-light-color-theme.json
index f68fdfb022f2b6a8c4c6dda161e9c5afe3774f82..52a096b5fc51b030dbddda9ad0fb200e1962e5c5 100644
--- a/extensions/theme-solarized-light/themes/solarized-light-color-theme.json
+++ b/extensions/theme-solarized-light/themes/solarized-light-color-theme.json
@@ -436,7 +436,7 @@
 		// "tab.activeBackground": "",
 		// "tab.activeForeground": "",
 		// "tab.inactiveForeground": "",
-		"tab.lastPinnedBorder": "#EEE8D5",
+		"tab.lastPinnedBorder": "#FDF6E3",
 
 		// Workbench: Activity Bar
 		"activityBar.background": "#DDD6C1",
diff --git a/src/vs/workbench/common/theme.ts b/src/vs/workbench/common/theme.ts
index b8536154371812a9cf16a8acb353c2562927fea2..fb4a4d67db686109264c9ad87985d30b4d2c6609 100644
--- a/src/vs/workbench/common/theme.ts
+++ b/src/vs/workbench/common/theme.ts
@@ -4,7 +4,7 @@
  *--------------------------------------------------------------------------------------------*/
 
 import * as nls from 'vs/nls';
-import { registerColor, editorBackground, contrastBorder, transparent, editorWidgetBackground, textLinkForeground, lighten, darken, focusBorder, activeContrastBorder, editorWidgetForeground, editorErrorForeground, editorWarningForeground, editorInfoForeground } from 'vs/platform/theme/common/colorRegistry';
+import { registerColor, editorBackground, contrastBorder, transparent, editorWidgetBackground, textLinkForeground, lighten, darken, focusBorder, activeContrastBorder, editorWidgetForeground, editorErrorForeground, editorWarningForeground, editorInfoForeground, treeIndentGuidesStroke } from 'vs/platform/theme/common/colorRegistry';
 import { IColorTheme } from 'vs/platform/theme/common/themeService';
 import { Color } from 'vs/base/common/color';
 
@@ -116,8 +116,8 @@ export const TAB_BORDER = registerColor('tab.border', {
 }, nls.localize('tabBorder', "Border to separate tabs from each other. Tabs are the containers for editors in the editor area. Multiple tabs can be opened in one editor group. There can be multiple editor groups."));
 
 export const TAB_LAST_PINNED_BORDER = registerColor('tab.lastPinnedBorder', {
-	dark: null,
-	light: null,
+	dark: treeIndentGuidesStroke,
+	light: treeIndentGuidesStroke,
 	hc: contrastBorder
 }, nls.localize('lastPinnedTabBorder', "Border to separate pinned tabs from other tabs. Tabs are the containers for editors in the editor area. Multiple tabs can be opened in one editor group. There can be multiple editor groups."));