diff --git a/.appveyor.yml b/.appveyor.yml
index 65d78d226..f7411cede 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -52,8 +52,8 @@ install:
   # pip will build them from source using the MSVC compiler matching the
   # target Python version and architecture
   - ECHO "Install pip requirements:"
-  - "pip install -r requirements.txt"
-  - "pip install PyInstaller"
+  - "python -m ip install -r requirements.txt"
+  - "python -m pip install PyInstaller"
 
 before_build:
     # directory that will contain the built files