diff --git a/calc/calc.php b/calc/calc.php
index 8c079dc7a..a299d45e9 100644
--- a/calc/calc.php
+++ b/calc/calc.php
@@ -17,7 +17,7 @@ function calc_uninstall() {
 }
 
 function calc_app_menu($a,&$b) {
-	$b['app_menu'] .= '<div class="app-title"><a href="calc">Calculator</a></div>'; 
+	$b['app_menu'][] = '<div class="app-title"><a href="calc">Calculator</a></div>'; 
 }
 
 
diff --git a/convert/convert.php b/convert/convert.php
index 7a4c90a53..751316503 100644
--- a/convert/convert.php
+++ b/convert/convert.php
@@ -15,7 +15,7 @@ function convert_uninstall() {
 }
 
 function convert_app_menu($a,&$b) {
-	$b['app_menu'] .= '<div class="app-title"><a href="convert">Units Conversion</a></div>'; 
+	$b['app_menu'][] = '<div class="app-title"><a href="convert">Units Conversion</a></div>'; 
 }
 
 
diff --git a/sniper/sniper.php b/sniper/sniper.php
index 8d31e9cd1..cdb5c5021 100644
--- a/sniper/sniper.php
+++ b/sniper/sniper.php
@@ -16,7 +16,7 @@ function sniper_uninstall() {
 }
 
 function sniper_app_menu($a,&$b) {
-    $b['app_menu'] .= '<div class="app-title"><a href="sniper">Hot Shot Sniper</a></div>';
+    $b['app_menu'][] = '<div class="app-title"><a href="sniper">Hot Shot Sniper</a></div>';
 }
 
 
diff --git a/tictac/tictac.php b/tictac/tictac.php
index d6cec08a0..1dd1ccb0e 100644
--- a/tictac/tictac.php
+++ b/tictac/tictac.php
@@ -17,7 +17,7 @@ function tictac_uninstall() {
 }
 
 function tictac_app_menu($a,&$b) {
-	$b['app_menu'] .= '<div class="app-title"><a href="tictac">' . t('Three Dimensional Tic-Tac-Toe') . '</a></div>'; 
+	$b['app_menu'][] = '<div class="app-title"><a href="tictac">' . t('Three Dimensional Tic-Tac-Toe') . '</a></div>'; 
 }