diff --git a/nodepool/driver/aws/adapter.py b/nodepool/driver/aws/adapter.py
index 42b602640..b015fef95 100644
--- a/nodepool/driver/aws/adapter.py
+++ b/nodepool/driver/aws/adapter.py
@@ -459,9 +459,6 @@ class AwsAdapter(statemachine.Adapter):
                 if code in args:
                     continue
                 if not code:
-                    self.log.warning(
-                        "Unknown quota code for instance type: %s",
-                        instance_type)
                     continue
                 if code not in ec2_quotas:
                     self.log.warning(
@@ -929,7 +926,13 @@ class AwsAdapter(statemachine.Adapter):
         m = self.instance_key_re.match(instance_type)
         if m:
             key = m.group(1)
-            return QUOTA_CODES.get(key)[market_type_option]
+            code = QUOTA_CODES.get(key)
+            if code:
+                return code[market_type_option]
+            self.log.warning(
+                "Unknown quota code for instance type: %s",
+                instance_type)
+        return None
 
     def _getQuotaForInstanceType(self, instance_type, market_type_option):
         try:
diff --git a/nodepool/tests/fixtures/aws/aws-quota.yaml b/nodepool/tests/fixtures/aws/aws-quota.yaml
index bc040094e..10b202ddf 100644
--- a/nodepool/tests/fixtures/aws/aws-quota.yaml
+++ b/nodepool/tests/fixtures/aws/aws-quota.yaml
@@ -17,6 +17,7 @@ labels:
   - name: high
   - name: spot
   - name: on-demand
+  - name: unknown
 
 providers:
   - name: ec2-us-west-2
@@ -52,3 +53,7 @@ providers:
             cloud-image: ubuntu1404
             instance-type: m6i.32xlarge
             key-name: zuul
+          - name: unknown
+            cloud-image: ubuntu1404
+            instance-type: is4gen.medium
+            key-name: zuul
diff --git a/nodepool/tests/unit/test_driver_aws.py b/nodepool/tests/unit/test_driver_aws.py
index 41c4d5878..52d0f9772 100644
--- a/nodepool/tests/unit/test_driver_aws.py
+++ b/nodepool/tests/unit/test_driver_aws.py
@@ -398,6 +398,22 @@ class TestDriverAws(tests.DBTestCase):
         req3 = self.waitForNodeRequest(req3)
         self.assertSuccess(req3)
 
+    def test_aws_multi_quota_unknown(self):
+        # Test multiple instance type quotas (standard, high-mem and spot)
+        configfile = self.setup_config('aws/aws-quota.yaml')
+        pool = self.useNodepool(configfile, watermark_sleep=1)
+        pool.start()
+
+        # We don't have quota information for this node type; make
+        # sure we can still launch a node with it.
+        req1 = zk.NodeRequest()
+        req1.state = zk.REQUESTED
+        req1.node_types.append('unknown')
+        self.zk.storeNodeRequest(req1)
+        self.log.debug("Waiting for request %s", req1.id)
+        req1 = self.waitForNodeRequest(req1)
+        self.assertSuccess(req1)
+
     @ec2_quotas({
         'L-1216C47A': 1000,
         'L-43DA4232': 1000,