diff --git a/src/lib/Smr/Alliance.php b/src/lib/Smr/Alliance.php
index eba9aebb1..8d3f76794 100644
--- a/src/lib/Smr/Alliance.php
+++ b/src/lib/Smr/Alliance.php
@@ -40,6 +40,10 @@ class Alliance {
 	public const RECRUIT_CLOSED = 'closed';
 	public const RECRUIT_PASSWORD = 'password';
 
+	// Database constraints
+	public const MAXLENGTH_NAME = 36; // varchar(36)
+	public const MAXLENGTH_DESCRIPTION = 255; // varchar(255)
+
 	public static function clearCache(): void {
 		self::$CACHE_ALLIANCES = [];
 	}
diff --git a/src/templates/Default/engine/Default/alliance_create.php b/src/templates/Default/engine/Default/alliance_create.php
index 54511e389..2c5fd9cf9 100644
--- a/src/templates/Default/engine/Default/alliance_create.php
+++ b/src/templates/Default/engine/Default/alliance_create.php
@@ -11,11 +11,11 @@
 	<table class="standard">
 		<tr>
 			<td class="top">Name:</td>
-			<td><input required type="text" name="name" size="30"></td>
+			<td><input required type="text" name="name" maxlength="<?php echo Alliance::MAXLENGTH_NAME; ?>" size="30"></td>
 		</tr>
 		<tr>
 			<td class="top">Description:</td>
-			<td><textarea spellcheck="true" name="description"></textarea></td>
+			<td><textarea spellcheck="true" name="description" maxlength="<?php echo Alliance::MAXLENGTH_DESCRIPTION; ?>"></textarea></td>
 		</tr>
 		<tr>
 			<td class="top">Members start with:&nbsp;&nbsp;&nbsp;</td>
diff --git a/src/templates/Default/engine/Default/alliance_stat.php b/src/templates/Default/engine/Default/alliance_stat.php
index debcec274..9a0f236eb 100644
--- a/src/templates/Default/engine/Default/alliance_stat.php
+++ b/src/templates/Default/engine/Default/alliance_stat.php
@@ -36,7 +36,7 @@
 
 if ($CanChangeDescription) { ?>
 	<tr>
-		<td class="top">Description:&nbsp;</td><td><textarea spellcheck="true" name="description"><?php echo $Alliance->getDescription(); ?></textarea></td>
+		<td class="top">Description:&nbsp;</td><td><textarea spellcheck="true" name="description" maxlength="<?php echo Alliance::MAXLENGTH_DESCRIPTION; ?>"><?php echo $Alliance->getDescription(); ?></textarea></td>
 	</tr><?php
 }