diff --git a/library/fonctions/useragent.php b/library/fonctions/useragent.php
index 489eea1f9f0f8df3aa02ba9202817672d8a98744..10d67ce6ff6946fb98088b6e210d276beb384833 100644
--- a/library/fonctions/useragent.php
+++ b/library/fonctions/useragent.php
@@ -35,7 +35,7 @@ function isTelephone() {
 
 
 function isUserAgentBot($useragent) {
-	return false !== strpos(strtoupper($useragent), 'BOT/');
+	return 0 !== preg_match('/(bot\/|sistrix|voilabot)/i', $useragent);
 }
 
 
diff --git a/tests/library/fonctions/UserAgentTest.php b/tests/library/fonctions/UserAgentTest.php
index 13c8bdfb0320d3799f74b3e9f999bbcf3aa1422f..6fa6eb8bc767ba03d9d96836431426f91cad890b 100644
--- a/tests/library/fonctions/UserAgentTest.php
+++ b/tests/library/fonctions/UserAgentTest.php
@@ -42,6 +42,40 @@ class BotUserAgentTest extends PHPUnit_Framework_TestCase {
 																															 date('H')+1,
 																															 date('H')+2));
 	}
+
+
+	public function botUserAgents() {
+		return [
+			['Mozilla/5.0 (compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm)'],
+			['Mozilla/5.0 (compatible; SISTRIX Crawler; http://crawler.sistrix.net/)'],
+			['Mozilla/5.0 (Windows NT 5.1; U; Win64; fr; rv:1.8.1) VoilaBot BETA 1.2 (support.voilabot@orange-ftgroup.com)'],
+			];
+	}
+
+	/** 
+	 * @dataProvider botUserAgents
+	 * @test 
+	 */
+	public function isUserAgentShouldReturnTrueForAgent($agent) {
+		$this->assertTrue(isUserAgentBot($agent));
+	}
+
+
+	public function browserUserAgents() {
+		return [
+			['Mozilla/5.0'],
+			['Webkit'],
+			['Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; )']
+			];
+	}
+
+	/** 
+	 * @dataProvider browserUserAgents
+	 * @test 
+	 */
+	public function isUserAgentShouldReturnFalseForAgent($agent) {
+		$this->assertFalse(isUserAgentBot($agent));
+	}
 }
 
 ?>
\ No newline at end of file