diff --git a/ext/danbooru_api/main.php b/ext/danbooru_api/main.php
index 0892e3fd..085a7cc1 100644
--- a/ext/danbooru_api/main.php
+++ b/ext/danbooru_api/main.php
@@ -271,7 +271,7 @@ class DanbooruApi extends Extension
             }
         } elseif (isset($_REQUEST['source']) || isset($_REQUEST['post']['source'])) {    // A url was provided
             $source = isset($_REQUEST['source']) ? $_REQUEST['source'] : $_REQUEST['post']['source'];
-            $file = tempnam("/tmp", "shimmie_transload");
+            $file = tempnam(sys_get_temp_dir(), "shimmie_transload");
             $ok = transload($source, $file);
             if (!$ok) {
                 $page->set_code(409);
diff --git a/ext/media/main.php b/ext/media/main.php
index 0ec336ed..ae68d477 100644
--- a/ext/media/main.php
+++ b/ext/media/main.php
@@ -364,7 +364,7 @@ class Media extends Extension
         }
 
         $inname = warehouse_path(Image::IMAGE_DIR, $hash);
-        $tmpname = tempnam("/tmp", "shimmie_ffmpeg_thumb");
+        $tmpname = tempnam(sys_get_temp_dir(), "shimmie_ffmpeg_thumb");
         $outname = warehouse_path(Image::THUMBNAIL_DIR, $hash);
 
         $orig_size = self::video_size($inname);
diff --git a/ext/ouroboros_api/main.php b/ext/ouroboros_api/main.php
index f0f983bf..ee52555c 100644
--- a/ext/ouroboros_api/main.php
+++ b/ext/ouroboros_api/main.php
@@ -475,7 +475,7 @@ class OuroborosAPI extends Extension
         ) !== false
         ) {
             // Transload from source
-            $meta['file'] = tempnam('/tmp', 'shimmie_transload_' . $config->get_string('transload_engine'));
+            $meta['file'] = tempnam(sys_get_temp_dir(), 'shimmie_transload_' . $config->get_string(UploadConfig::TRANSLOAD_ENGINE));
             $meta['filename'] = basename($post->file_url);
             if (!transload($post->file_url, $meta['file'])) {
                 $this->sendResponse(500, 'Transloading failed');
diff --git a/ext/resize/main.php b/ext/resize/main.php
index ea03abe4..7658cc89 100644
--- a/ext/resize/main.php
+++ b/ext/resize/main.php
@@ -198,7 +198,7 @@ class ResizeImage extends Extension
         list($new_height, $new_width) = $this->calc_new_size($image_obj, $width, $height);
 
         /* Temp storage while we resize */
-        $tmp_filename = tempnam("/tmp", 'shimmie_resize');
+        $tmp_filename = tempnam(sys_get_temp_dir(), 'shimmie_resize');
         if (empty($tmp_filename)) {
             throw new ImageResizeException("Unable to save temporary image file.");
         }
diff --git a/ext/transcode/main.php b/ext/transcode/main.php
index c68d2665..134e18df 100644
--- a/ext/transcode/main.php
+++ b/ext/transcode/main.php
@@ -308,7 +308,7 @@ class TranscodeImage extends Extension
 
         $q = $config->get_int("transcode_quality");
 
-        $tmp_name = tempnam("/tmp", "shimmie_transcode");
+        $tmp_name = tempnam(sys_get_temp_dir(), "shimmie_transcode");
 
         $image = imagecreatefromstring(file_get_contents($source_name));
         try {
@@ -383,7 +383,8 @@ class TranscodeImage extends Extension
                 $bg = "black";
                 break;
         }
-        $tmp_name = tempnam("/tmp", "shimmie_transcode");
+
+        $tmp_name = tempnam(sys_get_temp_dir(), "shimmie_transcode");
 
         $source_type = "";
         switch ($source_format) {