diff --git a/asv/runner.py b/asv/runner.py
index 11d746e8f..7f9720816 100644
--- a/asv/runner.py
+++ b/asv/runner.py
@@ -728,7 +728,7 @@ def __init__(self, env, root):
 
     def _stdout_reader(self):
         try:
-            out, _ = self.server_proc.communicate()
+            out = self.server_proc.stdout.read()
             out = out.decode('utf-8', 'replace')
         except Exception as exc:
             import traceback
@@ -815,6 +815,7 @@ def close(self):
             # Kill process group
             util._killpg_safe(self.server_proc.pid, signal.SIGKILL)
 
+        self.server_proc.wait()
         self.stdout_reader_thread.join()
 
         if self._server_output and not self.interrupted: