diff --git a/core/database.class.php b/core/database.class.php
index 254dbffa..f2e9fcc2 100644
--- a/core/database.class.php
+++ b/core/database.class.php
@@ -371,7 +371,7 @@ class Database {
 
 		$tags = array_map(array($this, 'resolve_alias'), $tags);
 		$tags = array_map(array($this, 'sanitise'), $tags);
-		$tags = array_unique($tags); // remove any duplicate tags
+		$tags = array_iunique($tags); // remove any duplicate tags
 
 		// delete old
 		$this->delete_tags_from_image($image_id);
diff --git a/core/util.inc.php b/core/util.inc.php
index 0170cba4..aceac770 100644
--- a/core/util.inc.php
+++ b/core/util.inc.php
@@ -343,6 +343,23 @@ function array_contains($array, $target) {
 	return false;
 }
 
+// case insensetive uniqueness
+function array_iunique($array) {
+	$ok = array();
+	foreach($array as $element) {
+		$found = false;
+		foreach($ok as $existing) {
+			if(strtolower($element) == strtolower($existing)) {
+				$found = true; break;
+			}
+		}
+		if(!$found) {
+			$ok[] = $element;
+		}
+	}
+	return $ok;
+}
+
 // from http://uk.php.net/network
 function ip_in_range($IP, $CIDR) {
 	list ($net, $mask) = split ("/", $CIDR);