diff --git a/.azure-pipelines/steps/install-nodejs.yml b/.azure-pipelines/steps/install-nodejs.yml
index b431abaa0..2f62abd44 100644
--- a/.azure-pipelines/steps/install-nodejs.yml
+++ b/.azure-pipelines/steps/install-nodejs.yml
@@ -3,3 +3,8 @@ steps:
     inputs:
       versionSpec: "$(node_version)"
     displayName: "Install Node.js"
+
+  # workaround for https://github.com/yarnpkg/yarn/issues/6900
+  - script: npm install -g yarn@1.12.3
+    displayName: "Install Node v4 compatible Yarn"
+    condition: eq(variables.node_version, 4)