diff --git a/.circleci/config.yml b/.circleci/config.yml
index 154e3d841e..30af27d0d0 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -288,7 +288,7 @@ jobs:
           name: Check vendored schema for upstream updates
           command: |
             bin/update-schema.sh HEAD
-            if ! git diff --exit-code HEAD -- glean-core/preview/tests/glean.1.schema.json; then
+            if ! git diff --exit-code HEAD -- glean.1.schema.json; then
               echo "===================================="
               echo "Latest schema from upstream changed."
               echo "Please regenerate the file using:"
diff --git a/glean.1.schema.json b/glean.1.schema.json
index d80b1adfe1..530e454275 100644
--- a/glean.1.schema.json
+++ b/glean.1.schema.json
@@ -923,6 +923,15 @@
                 "type": "string"
               },
               "type": "object"
+            },
+            "session_sample_rate": {
+              "description": "Remote override for the session sampling rate (0.0–1.0).",
+              "maximum": 1.0,
+              "minimum": 0.0,
+              "type": [
+                "number",
+                "null"
+              ]
             }
           },
           "type": "object"