diff --git a/.build-steps.yml b/.build-steps.yml
index 3259aa51e..41703246c 100644
--- a/.build-steps.yml
+++ b/.build-steps.yml
@@ -19,7 +19,7 @@ steps:
         displayName: "Run tests"
   - ${{ if eq(parameters.linux, 'true') }}:
       - bash: |
-          export RUSTUP_TOOLCHAIN="nightly-2020-02-17"
+          export RUSTUP_TOOLCHAIN="nightly-2020-02-06"
           cargo install grcov
           export CARGO_INCREMENTAL=0
           export RUSTFLAGS="-Zprofile -Ccodegen-units=1 -Cinline-threshold=0 -Clink-dead-code -Coverflow-checks=off -Zno-landing-pads"