diff --git a/src/main/java/eu/siacs/conversations/entities/Conversation.java b/src/main/java/eu/siacs/conversations/entities/Conversation.java
index 492f11503aadbb336581951b3ccf65dca6a56b03..175c67be0208f3c1666553a14086403d458d4b33 100644
--- a/src/main/java/eu/siacs/conversations/entities/Conversation.java
+++ b/src/main/java/eu/siacs/conversations/entities/Conversation.java
@@ -189,6 +189,10 @@ public class Conversation extends AbstractEntity
     public static final String MODE = "mode";
     public static final String ATTRIBUTES = "attributes";
 
+    static String truncatedAttributesColumn() {
+        return "SUBSTR(" + ATTRIBUTES + ", 0, " + (Short.MAX_VALUE << 1) + ") AS " + ATTRIBUTES;
+    }
+
     public static final String[] ALL_COLUMNS = new String[] {
         UUID,
         NAME,
@@ -198,12 +202,7 @@ public class Conversation extends AbstractEntity
         STATUS,
         CREATED,
         MODE,
-        String.format(
-            "SUBSTR(%s, 0, %d) AS %s",
-            ATTRIBUTES,
-            Short.MAX_VALUE << 1,
-            ATTRIBUTES
-        )
+        truncatedAttributesColumn()
     };
 
 
diff --git a/src/test/java/eu/siacs/conversations/entities/ConversationAllColumnsLocaleTest.java b/src/test/java/eu/siacs/conversations/entities/ConversationAllColumnsLocaleTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..e0866738f56695c0f597237058ee434a442c05f1
--- /dev/null
+++ b/src/test/java/eu/siacs/conversations/entities/ConversationAllColumnsLocaleTest.java
@@ -0,0 +1,42 @@
+package eu.siacs.conversations.entities;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.Locale;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.annotation.Config;
+import org.robolectric.annotation.ConscryptMode;
+
+import android.os.Build;
+import eu.siacs.conversations.Conversations;
+
+@RunWith(RobolectricTestRunner.class)
+@Config(sdk = Build.VERSION_CODES.TIRAMISU, application = Conversations.class)
+@ConscryptMode(ConscryptMode.Mode.OFF)
+public class ConversationAllColumnsLocaleTest {
+    private Locale originalLocale;
+
+    @Before
+    public void setUp() {
+        originalLocale = Locale.getDefault();
+        Locale.setDefault(new Locale("fa"));
+    }
+
+    @After
+    public void tearDown() {
+        Locale.setDefault(originalLocale);
+    }
+
+    @Test
+    public void truncatedAttributesColumnUsesAsciiDigits() {
+        assertEquals(
+            "SUBSTR(attributes, 0, 65534) AS attributes",
+            Conversation.truncatedAttributesColumn()
+        );
+    }
+}