diff --git a/loris/transforms.py b/loris/transforms.py
index 700382e9..a4d14def 100644
--- a/loris/transforms.py
+++ b/loris/transforms.py
@@ -272,7 +272,7 @@ def _create_fifo(self, tmp):
     def _run_transform(self, target_fp, image_request, image_info, transform_cmd, fifo_fp):
         try:
             expand_proc = subprocess.Popen(transform_cmd, shell=True, bufsize=-1,
-                stderr=subprocess.PIPE, env=self.env)
+                stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=self.env)
             with open(fifo_fp, 'rb') as f:
                 # read from the named pipe
                 p = Parser()