diff --git a/include/datetime.php b/include/datetime.php
index 779c7a5aad..8d4961cd7c 100644
--- a/include/datetime.php
+++ b/include/datetime.php
@@ -571,6 +571,17 @@ function update_contact_birthdays() {
 			 *
 			 */
 
+			// Check for duplicates
+			$s = q("SELECT `id` FROM `event` WHERE `uid` = %d AND `cid` = %d AND `start` = '%s' AND `type` = '%s' LIMIT 1",
+				intval($rr['uid']),
+				intval($rr['id']),
+				dbesc(datetime_convert('UTC','UTC', $nextbd)),
+				dbesc('birthday'));
+
+			if (dbm::is_result($s)) {
+				continue;
+			}
+
 			$bdtext = sprintf( t('%s\'s birthday'), $rr['name']);
 			$bdtext2 = sprintf( t('Happy Birthday %s'), ' [url=' . $rr['url'] . ']' . $rr['name'] . '[/url]') ;
 
diff --git a/include/dfrn.php b/include/dfrn.php
index ccb43fa98e..e9bdaec664 100644
--- a/include/dfrn.php
+++ b/include/dfrn.php
@@ -1105,12 +1105,22 @@ class dfrn {
 	 */
 	private function birthday_event($contact, $birthday) {
 
+		// Check for duplicates
+		$r = q("SELECT `id` FROM `event` WHERE `uid` = %d AND `cid` = %d AND `start` = '%s' AND `type` = '%s' LIMIT 1",
+			intval($contact["uid"]),
+			intval($contact["id"]),
+			dbesc(datetime_convert("UTC","UTC", $birthday)),
+			dbesc("birthday"));
+
+		if (dbm::is_result($r)) {
+			return;
+		}
+
 		logger("updating birthday: ".$birthday." for contact ".$contact["id"]);
 
 		$bdtext = sprintf(t("%s\'s birthday"), $contact["name"]);
 		$bdtext2 = sprintf(t("Happy Birthday %s"), " [url=".$contact["url"]."]".$contact["name"]."[/url]") ;
 
-
 		$r = q("INSERT INTO `event` (`uid`,`cid`,`created`,`edited`,`start`,`finish`,`summary`,`desc`,`type`)
 			VALUES ( %d, %d, '%s', '%s', '%s', '%s', '%s', '%s', '%s') ",
 			intval($contact["uid"]),
diff --git a/include/event.php b/include/event.php
index 785558bedd..7b380b1c78 100644
--- a/include/event.php
+++ b/include/event.php
@@ -493,6 +493,25 @@ function get_event_strings() {
 	return $i18n;
 }
 
+/**
+ * @brief Removes duplicated birthday events
+ *
+ * @param array $dates Array of possibly duplicated events
+ * @return array Cleaned events
+ */
+function event_remove_duplicates($dates) {
+	$dates2 = array();
+
+	foreach ($dates AS $date) {
+		if ($date['type'] == 'birthday') {
+			$dates2[$date['uid']."-".$date['cid']."-".$date['start']] = $date;
+		} else {
+			$dates2[] = $date;
+		}
+	}
+	return $dates2;
+}
+
 /**
  * @brief Get an event by its event ID
  *
@@ -516,9 +535,9 @@ function event_by_id($owner_uid = 0, $event_params, $sql_extra = '') {
 		intval($event_params["event_id"])
 	);
 
-	if (dbm::is_result($r))
-		return $r;
-
+	if (dbm::is_result($r)) {
+		return event_remove_duplicates($r);
+	}
 }
 
 /**
@@ -558,8 +577,9 @@ function events_by_date($owner_uid = 0, $event_params, $sql_extra = '') {
 			dbesc($event_params["adjust_finish"])
 	);
 
-	if (dbm::is_result($r))
-		return $r;
+	if (dbm::is_result($r)) {
+		return event_remove_duplicates($r);
+	}
 }
 
 /**
@@ -568,7 +588,7 @@ function events_by_date($owner_uid = 0, $event_params, $sql_extra = '') {
  * @param array $arr Event query array
  * @return array Event array for the template
  */
-function process_events ($arr) {
+function process_events($arr) {
 	$events=array();
 
 	$last_date = '';