diff --git a/appveyor.yml b/appveyor.yml
index 55c2ddae..f1b37073 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -10,7 +10,6 @@ environment:
       CHANNEL: stable
     - TARGET: x86_64-pc-windows-msvc
       CHANNEL: nightly
-      TESTFLAGS: --features=cfzlib
 
 # Install Rust and Cargo
 # (Based on from https://github.com/rust-lang/libc/blob/master/appveyor.yml)