diff --git a/build/pipelines/ob-nightly.yml b/build/pipelines/ob-nightly.yml
index 18a1a1ddec..ca863eb00f 100644
--- a/build/pipelines/ob-nightly.yml
+++ b/build/pipelines/ob-nightly.yml
@@ -28,7 +28,7 @@ extends:
     official: true
     branding: Canary
     buildTerminal: true
-    pgoBuildMode: Optimize
+    pgoBuildMode: None # BODGY - OneBranch is on VS 17.10, which is known to be the worst
     codeSign: true
     signingIdentity:
       serviceName: $(SigningServiceName)