diff --git a/res/values/themes.xml b/res/values/themes.xml
index 0bd1d8ed1f..15e71c2d96 100644
--- a/res/values/themes.xml
+++ b/res/values/themes.xml
@@ -585,7 +585,11 @@
         <item name="shared_contact_item_button_color">@color/core_grey_85</item>
     </style>
     
-    <style name="RationaleDialog" parent="Theme.AppCompat.Light.Dialog.Alert">
+    <style name="RationaleDialogLight" parent="Theme.AppCompat.Light.Dialog.Alert">
+        <item name="android:windowBackground">@drawable/permission_rationale_dialog_corners</item>
+    </style>
+
+    <style name="RationaleDialogDark" parent="Theme.AppCompat.Dialog.Alert">
         <item name="android:windowBackground">@drawable/permission_rationale_dialog_corners</item>
     </style>
 
diff --git a/src/org/thoughtcrime/securesms/lock/RegistrationLockDialog.java b/src/org/thoughtcrime/securesms/lock/RegistrationLockDialog.java
index ac5c45f6ca..a2d5df9e48 100644
--- a/src/org/thoughtcrime/securesms/lock/RegistrationLockDialog.java
+++ b/src/org/thoughtcrime/securesms/lock/RegistrationLockDialog.java
@@ -32,6 +32,7 @@ import org.thoughtcrime.securesms.R;
 import org.thoughtcrime.securesms.components.SwitchPreferenceCompat;
 import org.thoughtcrime.securesms.util.ServiceUtil;
 import org.thoughtcrime.securesms.util.TextSecurePreferences;
+import org.thoughtcrime.securesms.util.ThemeUtil;
 import org.whispersystems.libsignal.util.guava.Optional;
 import org.whispersystems.signalservice.api.SignalServiceAccountManager;
 
@@ -45,11 +46,11 @@ public class RegistrationLockDialog {
     if (!RegistrationLockReminders.needsReminder(context))    return;
     if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) return;
 
-    AlertDialog dialog      = new AlertDialog.Builder(context, R.style.RationaleDialog)
-                                             .setView(R.layout.registration_lock_reminder_view)
-                                             .setCancelable(true)
-                                             .setOnCancelListener(d -> RegistrationLockReminders.scheduleReminder(context, false))
-                                             .create();
+    AlertDialog dialog = new AlertDialog.Builder(context, ThemeUtil.isDarkTheme(context) ? R.style.RationaleDialogDark : R.style.RationaleDialogLight)
+                                        .setView(R.layout.registration_lock_reminder_view)
+                                        .setCancelable(true)
+                                        .setOnCancelListener(d -> RegistrationLockReminders.scheduleReminder(context, false))
+                                        .create();
 
     WindowManager  windowManager = ServiceUtil.getWindowManager(context);
     Display        display       = windowManager.getDefaultDisplay();
diff --git a/src/org/thoughtcrime/securesms/permissions/RationaleDialog.java b/src/org/thoughtcrime/securesms/permissions/RationaleDialog.java
index 271d2f2d90..dcd4e6a4da 100644
--- a/src/org/thoughtcrime/securesms/permissions/RationaleDialog.java
+++ b/src/org/thoughtcrime/securesms/permissions/RationaleDialog.java
@@ -19,6 +19,7 @@ import android.widget.LinearLayout.LayoutParams;
 import android.widget.TextView;
 
 import org.thoughtcrime.securesms.R;
+import org.thoughtcrime.securesms.util.ThemeUtil;
 import org.thoughtcrime.securesms.util.ViewUtil;
 
 public class RationaleDialog {
@@ -53,7 +54,8 @@ public class RationaleDialog {
 
     text.setText(message);
 
-    return new AlertDialog.Builder(context, R.style.RationaleDialog).setView(view);
+    return new AlertDialog.Builder(context, ThemeUtil.isDarkTheme(context) ? R.style.RationaleDialogDark : R.style.RationaleDialogLight)
+                          .setView(view);
   }
 
 }