diff --git a/appveyor.yml b/appveyor.yml
index 9781fbc..4ec2179 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -52,8 +52,8 @@ for:
         sudo apt-get install -qq swig
         
         if [[ "$PYTHON_BINDINGS" == "1" ]]; then
-            sudo apt-get install python3.5
-            sudo apt-get install python3.5-dev
+            sudo apt-get -y install python3.5
+            sudo apt-get -y install python3.5-dev
             alias python="/usr/bin/python3.5"
             python --version
         fi