diff --git a/app/src/main/kotlin/com/simplemobiletools/calculator/activities/SettingsActivity.kt b/app/src/main/kotlin/com/simplemobiletools/calculator/activities/SettingsActivity.kt
index 83179320..b99a0461 100644
--- a/app/src/main/kotlin/com/simplemobiletools/calculator/activities/SettingsActivity.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/calculator/activities/SettingsActivity.kt
@@ -4,11 +4,13 @@ import android.content.Intent
 import android.os.Bundle
 import android.view.Menu
 import com.simplemobiletools.calculator.R
+import com.simplemobiletools.calculator.extensions.calculatorDB
 import com.simplemobiletools.calculator.extensions.config
 import com.simplemobiletools.calculator.extensions.refreshAppWidget
 import com.simplemobiletools.calculator.helpers.MyWidgetProvider
 import com.simplemobiletools.commons.extensions.*
 import com.simplemobiletools.commons.helpers.IS_CUSTOMIZING_COLORS
+import com.simplemobiletools.commons.helpers.ensureBackgroundThread
 import kotlinx.android.synthetic.main.activity_settings.*
 import java.util.*
 import kotlin.system.exitProcess
@@ -104,6 +106,7 @@ class SettingsActivity : SimpleActivity() {
             settings_use_comma_as_decimal_mark.toggle()
             config.useCommaAsDecimalMark = settings_use_comma_as_decimal_mark.isChecked
             refreshAppWidget<MyWidgetProvider>()
+            ensureBackgroundThread { applicationContext.calculatorDB.deleteHistory() }
         }
     }