diff --git a/platform/platform-impl/src/com/intellij/ide/ui/laf/darcula/ui/DarculaOptionButtonUI.kt b/platform/platform-impl/src/com/intellij/ide/ui/laf/darcula/ui/DarculaOptionButtonUI.kt
index 66fca71b1279..28a5f7179bcd 100644
--- a/platform/platform-impl/src/com/intellij/ide/ui/laf/darcula/ui/DarculaOptionButtonUI.kt
+++ b/platform/platform-impl/src/com/intellij/ide/ui/laf/darcula/ui/DarculaOptionButtonUI.kt
@@ -3,17 +3,16 @@ package com.intellij.ide.ui.laf.darcula.ui
 
 import com.intellij.ide.ui.laf.darcula.DarculaUIUtil.*
 import com.intellij.ide.ui.laf.darcula.ui.DarculaButtonUI.getDisabledTextColor
+import com.intellij.ide.ui.laf.darcula.ui.DarculaButtonUI.isDefaultButton
 import com.intellij.ide.ui.laf.darcula.ui.DarculaComboBoxUI.getArrowButtonPreferredSize
 import com.intellij.ui.components.BasicOptionButtonUI
 import com.intellij.util.ui.JBUI
 import com.intellij.util.ui.JBUI.scale
-import java.awt.Dimension
-import java.awt.Graphics
-import java.awt.Graphics2D
-import java.awt.RenderingHints
+import java.awt.*
 import java.awt.geom.Rectangle2D
 import javax.swing.AbstractButton
 import javax.swing.JComponent
+import javax.swing.UIManager
 import javax.swing.border.Border
 
 open class DarculaOptionButtonUI : BasicOptionButtonUI() {
@@ -89,10 +88,23 @@ open class DarculaOptionButtonUI : BasicOptionButtonUI() {
     val yOffset = BW.getFloat() + LW.getFloat() + scale(1)
     val x = mainButton.width.toFloat()
 
-    g.paint = (mainButton.border as DarculaButtonPainter).getBorderPaint(c)
+    g.paint = separatorColor(c)
     g.fill(Rectangle2D.Float(x, yOffset, LW.getFloat(), mainButton.height - yOffset * 2))
   }
 
+  private fun separatorColor(c: JComponent) : Paint {
+    val defButton = isDefaultButton(c as AbstractButton)
+    val hasFocus = c.hasFocus()
+
+    val resourceName = when {
+      defButton && !hasFocus -> "OptionButton.default.separatorColor"
+      !defButton && !hasFocus -> "OptionButton.separatorColor"
+      else -> null
+    }
+
+    return if (resourceName != null) UIManager.getColor(resourceName) else (mainButton.border as DarculaButtonPainter).getBorderPaint(c)
+  }
+
   override fun updateOptions(): Unit = super.updateOptions().also {
     optionButton.border = if (isSimpleButton) optionButtonBorder else mainButton.border
   }
diff --git a/platform/platform-resources/src/themes/HighContrast.theme.json b/platform/platform-resources/src/themes/HighContrast.theme.json
index 389eb7a86b7c..cb3639fae8aa 100644
--- a/platform/platform-resources/src/themes/HighContrast.theme.json
+++ b/platform/platform-resources/src/themes/HighContrast.theme.json
@@ -213,6 +213,11 @@
       }
     },
 
+    "OptionButton" : {
+      "default.separatorColor": "#000000",
+      "separatorColor": "#FFFFFF"
+    },
+
     "ParameterInfo": {
       "background": "#281A33",
       "foreground": "#CCCCCC",
diff --git a/platform/platform-resources/src/themes/metadata/JDK.themeMetadata.json b/platform/platform-resources/src/themes/metadata/JDK.themeMetadata.json
index 22c7f2a813fc..60e918691f37 100644
--- a/platform/platform-resources/src/themes/metadata/JDK.themeMetadata.json
+++ b/platform/platform-resources/src/themes/metadata/JDK.themeMetadata.json
@@ -659,6 +659,14 @@
       "key": "menuText",
       "deprecated": true
     },
+    {
+      "key": "OptionButton.default.separatorColor",
+      "description": "JBOptionButton separator color in default state."
+    },
+    {
+      "key": "OptionButton.separatorColor",
+      "description": "JBOptionButton separator color."
+    },
     {
       "key": "OptionPane.background"
     },