diff --git a/appveyor.yml b/appveyor.yml
index 08c39e1b6..f7881764a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,6 +1,7 @@
 version: 1.0.{build}
 install:
 - ps: |
+    C:\Python27-x64\Scripts\pip.exe install --upgrade pip
     C:\Python27-x64\Scripts\pip.exe install --egg scons
     C:\Python27-x64\Scripts\pip.exe install numpy
     C:\Python27-x64\Scripts\pip.exe install cython