diff --git a/eng/pipelines/coreclr/perf_slow.yml b/eng/pipelines/coreclr/perf_slow.yml
index f9232de84640c2..77a9384d02dd75 100644
--- a/eng/pipelines/coreclr/perf_slow.yml
+++ b/eng/pipelines/coreclr/perf_slow.yml
@@ -50,6 +50,9 @@ extends:
           jobTemplate: /eng/pipelines/common/build-coreclr-and-libraries-job.yml
           buildConfig: release
           container: ubuntu-18.04-cross-arm64
+          variables:
+            - name: ROOTFS_DIR
+              value: /crossrootfs/arm64
           platforms:
           - Linux_arm64
           jobParameters:
@@ -138,6 +141,9 @@ extends:
           container: ubuntu-18.04-cross-arm64
           runtimeFlavor: mono
           runtimeVariant: 'llvmaot'
+          variables:
+            - name: ROOTFS_DIR
+              value: /crossrootfs/arm64
           platforms:
           - Linux_arm64
           jobParameters: