diff --git a/appveyor.yml b/appveyor.yml
index 9ee087a2f..855561e69 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -19,7 +19,7 @@ environment:
 
 # Install Tox for running tests.
 install:
-    - cinst imagemagick
+    - cinst imagemagick -y
     - "%PYTHON%/Scripts/pip.exe install tox"
     - "%PYTHON%/Scripts/tox.exe -e %TOX_ENV% --notest"