diff --git a/build-system/global-configs/experiments-config.json b/build-system/global-configs/experiments-config.json
index 8f0b87d0f3fb..f061431de029 100644
--- a/build-system/global-configs/experiments-config.json
+++ b/build-system/global-configs/experiments-config.json
@@ -1,12 +1,5 @@
 {
-  "experimentA": {
-    "name": "IntersectionObserverPolyfill",
-    "environment": "AMP",
-    "command": "gulp dist --define_experiment_constant=INTERSECTION_OBSERVER_POLYFILL",
-    "issue": "https://github.com/ampproject/amphtml/issues/27807",
-    "expirationDateUTC": "2020-05-31",
-    "defineExperimentConstant": "INTERSECTION_OBSERVER_POLYFILL"
-  },
+  "experimentA": {},
   "experimentB": {},
   "experimentC": {}
 }
diff --git a/build-system/global-configs/experiments-const.json b/build-system/global-configs/experiments-const.json
index 195066a18f28..6f14ebdf84a6 100644
--- a/build-system/global-configs/experiments-const.json
+++ b/build-system/global-configs/experiments-const.json
@@ -1,4 +1,5 @@
 {
+  "INTERSECTION_OBSERVER_POLYFILL": true,
   "INTERSECTION_OBSERVER_POLYFILL_INABOX": false,
   "MOVE_FIXED_LAYER": false
 }