diff --git a/lambdas/indexer/.chalice/config.json.template.py b/lambdas/indexer/.chalice/config.json.template.py
index 6751ef223..dd77ae946 100644
--- a/lambdas/indexer/.chalice/config.json.template.py
+++ b/lambdas/indexer/.chalice/config.json.template.py
@@ -25,7 +25,6 @@
     "manage_iam_role": False,
     "iam_role_arn": "${aws_iam_role.%s.arn}" % app_name,
     "environment_variables": config.lambda_env,
-    "minimum_compression_size": config.minimum_compression_size,
     "lambda_timeout": config.api_gateway_lambda_timeout,
     "lambda_memory_size": 128,
     **chalice.vpc_lambda_config(app_name),
diff --git a/lambdas/indexer/openapi.json b/lambdas/indexer/openapi.json
index 7cc35b914..cd155a05a 100644
--- a/lambdas/indexer/openapi.json
+++ b/lambdas/indexer/openapi.json
@@ -5,6 +5,7 @@
         "description": "\nThis is the internal API for Azul's indexer component.\n",
         "version": "1.0"
     },
+    "x-amazon-apigateway-minimum-compression-size": 1024,
     "paths": {
         "/openapi": {
             "get": {
diff --git a/lambdas/service/.chalice/config.json.template.py b/lambdas/service/.chalice/config.json.template.py
index 46747fb3d..c40dff944 100644
--- a/lambdas/service/.chalice/config.json.template.py
+++ b/lambdas/service/.chalice/config.json.template.py
@@ -25,7 +25,6 @@
     "manage_iam_role": False,
     "iam_role_arn": "${aws_iam_role.%s.arn}" % app_name,
     "environment_variables": config.lambda_env,
-    "minimum_compression_size": config.minimum_compression_size,
     "lambda_timeout": config.api_gateway_lambda_timeout,
     "lambda_memory_size": 2048,
     **chalice.vpc_lambda_config(app_name),
diff --git a/lambdas/service/openapi.json b/lambdas/service/openapi.json
index 5cfd7759f..173338ff4 100644
--- a/lambdas/service/openapi.json
+++ b/lambdas/service/openapi.json
@@ -23,6 +23,7 @@
             "description": "\nDescribes various aspects of the Azul service\n"
         }
     ],
+    "x-amazon-apigateway-minimum-compression-size": 1024,
     "paths": {
         "/openapi": {
             "get": {
diff --git a/src/azul/chalice.py b/src/azul/chalice.py
index f7ad22b12..5c5575b39 100644
--- a/src/azul/chalice.py
+++ b/src/azul/chalice.py
@@ -126,6 +126,7 @@ def __init__(self,
         self.non_interactive_routes: set[tuple[str, str]] = set()
         if spec is not None:
             assert 'paths' not in spec, 'The top-level spec must not define paths'
+            spec['x-amazon-apigateway-minimum-compression-size'] = config.minimum_compression_size
             self._specs: Optional[MutableJSON] = copy_json(spec)
             self._specs['paths'] = {}
         else:
diff --git a/test/test_openapi.py b/test/test_openapi.py
index 0fb24e034..5bf142a1e 100644
--- a/test/test_openapi.py
+++ b/test/test_openapi.py
@@ -33,9 +33,16 @@ def app(self, spec):
         return AzulChaliceApp('testing', '/app.py', spec=spec)
 
     def test_top_level_spec(self):
-        spec = {'foo': 'bar'}
+        spec = {
+            'foo': 'bar',
+            'x-amazon-apigateway-minimum-compression-size': 1024
+        }
         app = self.app(spec)
-        self.assertEqual(app._specs, {'foo': 'bar', 'paths': {}}, "Confirm 'paths' is added")
+        self.assertEqual(app._specs, {
+            'foo': 'bar',
+            'x-amazon-apigateway-minimum-compression-size': 1024,
+            'paths': {}
+        }, "Confirm 'paths' is added")
         spec['new key'] = 'new value'
         self.assertNotIn('new key', app.spec(), 'Changing input object should not affect specs')
 
@@ -54,7 +61,8 @@ def route():
             'foo': 'bar',
             'paths': {},
             'tags': [],
-            'servers': [{'url': 'https://fake.url/'}]
+            'servers': [{'url': 'https://fake.url/'}],
+            'x-amazon-apigateway-minimum-compression-size': 1024
         }
         self.assertEqual(app.spec(), expected)
 
@@ -74,7 +82,8 @@ def route():
                 }
             },
             'tags': [],
-            'servers': [{'url': 'https://fake.url/'}]
+            'servers': [{'url': 'https://fake.url/'}],
+            'x-amazon-apigateway-minimum-compression-size': 1024
         }
         self.assertEqual(app.spec(), expected_spec)
 
@@ -91,7 +100,8 @@ def route():
                 '/foo': {'a': 'b'}
             },
             'tags': [],
-            'servers': [{'url': 'https://fake.url/'}]
+            'servers': [{'url': 'https://fake.url/'}],
+            'x-amazon-apigateway-minimum-compression-size': 1024
         }
         self.assertEqual(app.spec(), expected_spec)
 
@@ -130,7 +140,8 @@ def route():
                 }
             },
             'tags': [],
-            'servers': [{'url': 'https://fake.url/'}]
+            'servers': [{'url': 'https://fake.url/'}],
+            'x-amazon-apigateway-minimum-compression-size': 1024
         }
         self.assertEqual(app.spec(), expected_specs)