diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 1022333fc..014aded1f 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -5,6 +5,7 @@ variables:
   GIT_DEPTH: "3"
   SIMPLECOV: "true" 
   RUST_BACKTRACE: "1"
+  RUSTFLAGS: "-D warnings"
 cache:
   key: "$CI_BUILD_NAME/$CI_BUILD_REF_NAME"
   untracked: true
@@ -260,7 +261,7 @@ windows:
     - set INCLUDE=C:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\Include;C:\vs2015\VC\include;C:\Program Files (x86)\Windows Kits\10\Include\10.0.10240.0\ucrt
     - set LIB=C:\vs2015\VC\lib;C:\Program Files (x86)\Windows Kits\10\Lib\10.0.10240.0\ucrt\x64
     - set RUST_BACKTRACE=1
-    - set RUSTFLAGS=%RUSTFLAGS% -Zorbit=off -D warnings
+    - set RUSTFLAGS="-Zorbit=off -D warnings"
     - rustup default stable-x86_64-pc-windows-msvc
     - git submodule update --init
     - cargo build --release --verbose