diff --git a/appveyor.yml b/appveyor.yml
index 9621e9ab..020a2a62 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -17,9 +17,10 @@ install:
   - echo date.timezone="UTC" >> php.ini
   - echo extension_dir=ext >> php.ini
   - echo extension=php_openssl.dll >> php.ini
+  - echo extension=php_curl.dll >> php.ini
   - cd C:\projects\sodium_compat
   - SET PATH=C:\tools\php56;%PATH%
-  - php.exe -r "readfile('http://getcomposer.org/installer');" | php.exe
+  - php.exe -r "readfile('https://getcomposer.org/installer');" | php.exe
   - php.exe composer.phar install --prefer-source --no-interaction
 
 test_script: