diff --git a/libmproxy/utils.py b/libmproxy/utils.py
index 699cb8638..209ec27ad 100644
--- a/libmproxy/utils.py
+++ b/libmproxy/utils.py
@@ -14,6 +14,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 import re, os, subprocess, datetime, textwrap, errno, sys, time, functools
 
+CERT_SLEEP_TIME = 1
 
 def timestamp():
     """
@@ -485,6 +486,7 @@ def dummy_cert(certdir, ca, commonname):
             stdin=subprocess.PIPE
         )
         if ret: return None
+    time.sleep(CERT_SLEEP_TIME)
     return certpath
 
 
diff --git a/test/test_utils.py b/test/test_utils.py
index 94523676a..874b2c6f4 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -2,6 +2,8 @@ import textwrap, cStringIO, os, time, re
 import libpry
 from libmproxy import utils
 
+utils.CERT_SLEEP_TIME = 0
+
 
 class uformat_timestamp(libpry.AutoTree):
     def test_simple(self):