diff --git a/extensions/theme-abyss/themes/abyss-color-theme.json b/extensions/theme-abyss/themes/abyss-color-theme.json
index 0b568c23fad99..642a9e3d97b3e 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 cbf573c0e9d44..0f82502db7dad 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 ed8a7572f9000..8997b80df5565 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 8a67e377734ae..aa30b85b13058 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 5c467a999d3ce..2a12b3698854c 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 f68fdfb022f2b..52a096b5fc51b 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 b853615437181..fb4a4d67db686 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."));