diff --git a/app/src/main/java/protect/card_locker/MainActivity.java b/app/src/main/java/protect/card_locker/MainActivity.java
index c22c64649..bf48e3512 100644
--- a/app/src/main/java/protect/card_locker/MainActivity.java
+++ b/app/src/main/java/protect/card_locker/MainActivity.java
@@ -23,7 +23,10 @@ import android.widget.ListView;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import com.google.common.collect.ImmutableMap;
+
 import java.util.Calendar;
+import java.util.Map;
 
 public class MainActivity extends AppCompatActivity
 {
@@ -160,18 +163,18 @@ public class MainActivity extends AppCompatActivity
 
     private void displayAboutDialog()
     {
-        final String[][] USED_LIBRARIES = new String[][]
-        {
-            new String[] {"Commons CSV", "https://commons.apache.org/proper/commons-csv/"},
-            new String[] {"Guava", "https://github.com/google/guava"},
-            new String[] {"ZXing", "https://github.com/zxing/zxing"},
-            new String[] {"ZXing Android Embedded", "https://github.com/journeyapps/zxing-android-embedded"},
-        };
+        final Map<String, String> USED_LIBRARIES = ImmutableMap.of
+        (
+            "Commons CSV", "https://commons.apache.org/proper/commons-csv/",
+            "Guava", "https://github.com/google/guava",
+            "ZXing", "https://github.com/zxing/zxing",
+            "ZXing Android Embedded", "https://github.com/journeyapps/zxing-android-embedded"
+        );
 
         StringBuilder libs = new StringBuilder().append("<ul>");
-        for (String[] library : USED_LIBRARIES)
+        for (Map.Entry<String, String> entry : USED_LIBRARIES.entrySet())
         {
-            libs.append("<li><a href=\"").append(library[1]).append("\">").append(library[0]).append("</a></li>");
+            libs.append("<li><a href=\"").append(entry.getValue()).append("\">").append(entry.getKey()).append("</a></li>");
         }
         libs.append("</ul>");