diff --git a/api/fedora_collection.inc b/api/fedora_collection.inc
index b8afc5c4..a82bf39b 100644
--- a/api/fedora_collection.inc
+++ b/api/fedora_collection.inc
@@ -41,7 +41,7 @@ function export_collection($collection_pid, $relationship = 'isMemberOfCollectio
       fwrite($file, $item_foxml);
       fclose($file);
     }
-    if (system("cd $container;zip -r $collection_pid.zip $collection_pid/* >/dev/NULL") == 0) {
+    if (system("cd $container;zip -r $collection_pid.zip $collection_pid/* >/dev/null") == 0) {
       header("Content-type: application/zip");
       header('Content-Disposition: attachment; filename="' . $collection_pid . '.zip' . '"');
       $fh = fopen($container . '/' . $collection_pid . '.zip', 'r');
diff --git a/plugins/ImageManipulation.inc b/plugins/ImageManipulation.inc
index 0351adbe..8f97ab94 100644
--- a/plugins/ImageManipulation.inc
+++ b/plugins/ImageManipulation.inc
@@ -211,7 +211,7 @@ class ImageManipulation {
     }
     elseif (stristr($_SERVER['SERVER_SOFTWARE'], 'unix')) {
       // Use this for Mac OS X (MAMP)
-      $cmdline = "sips -s format jpeg \"$file\" -z $height $height --out \"$file$file_suffix\" >/dev/NULL";
+      $cmdline = "sips -s format jpeg \"$file\" -z $height $height --out \"$file$file_suffix\" >/dev/null";
     }
     else {
       $cmdline = "convert \"$file\"\[0\] -colorspace RGB -thumbnail " . $width . "x" . $height . " \"$file$file_suffix\"";