diff --git a/engine/src/flutter/ci/builders/mac_ios_engine.json b/engine/src/flutter/ci/builders/mac_ios_engine.json
index 6b382b36bfa..24b78fbd802 100644
--- a/engine/src/flutter/ci/builders/mac_ios_engine.json
+++ b/engine/src/flutter/ci/builders/mac_ios_engine.json
@@ -47,12 +47,14 @@
             "mac_model=Macmini8,1",
             "os=Mac"
         ],
-        "generators": [
-            {
-                "name": "BuildObjcDoc",
-                "script": "flutter/tools/gen_objcdoc.sh"
-            }
-        ],
+        "generators": {
+		"tasks": [
+			{
+				"name": "BuildObjcDoc",
+				"scripts": ["flutter/tools/gen_objcdoc.sh"]
+			}
+		]
+	},
         "gn": [
             "--bitcode",
             "--ios",
diff --git a/engine/src/flutter/ci/builders/mac_ios_engine_profile.json b/engine/src/flutter/ci/builders/mac_ios_engine_profile.json
index 682f8af7a27..dc4f2e25ab2 100644
--- a/engine/src/flutter/ci/builders/mac_ios_engine_profile.json
+++ b/engine/src/flutter/ci/builders/mac_ios_engine_profile.json
@@ -47,7 +47,7 @@
             "mac_model=Macmini8,1",
             "os=Mac"
         ],
-        "generators": [],
+        "generators": {},
         "gn": [
             "--ios",
             "--runtime-mode",
diff --git a/engine/src/flutter/ci/builders/mac_ios_engine_release.json b/engine/src/flutter/ci/builders/mac_ios_engine_release.json
index 79ff5229615..98c5b741606 100644
--- a/engine/src/flutter/ci/builders/mac_ios_engine_release.json
+++ b/engine/src/flutter/ci/builders/mac_ios_engine_release.json
@@ -49,7 +49,7 @@
             "mac_model=Macmini8,1",
             "os=Mac"
         ],
-        "generators": [],
+        "generators": {},
         "gn": [
             "--ios",
             "--runtime-mode",
diff --git a/engine/src/flutter/ci/builders/windows_host_engine.json b/engine/src/flutter/ci/builders/windows_host_engine.json
index 9443194fd9e..460f994ef43 100644
--- a/engine/src/flutter/ci/builders/windows_host_engine.json
+++ b/engine/src/flutter/ci/builders/windows_host_engine.json
@@ -67,7 +67,7 @@
         "gclient_custom_vars": {
           "download_android_deps": false
         },
-        "generators": [],
+        "generators": {},
         "gn": [
             "--runtime-mode",
             "release",