diff --git a/infrastructure/cloudformation/dt/lambdas.yaml b/infrastructure/cloudformation/dt/lambdas.yaml
index 369ab4c..322e49d 100644
--- a/infrastructure/cloudformation/dt/lambdas.yaml
+++ b/infrastructure/cloudformation/dt/lambdas.yaml
@@ -49,6 +49,7 @@ Resources:
   TaskListManagerLambda:
     Type: AWS::Lambda::Function
     Properties:
+      Handler: lambda_function.lambda_handler
       Runtime: python3.7
       Code:
         S3Bucket: sumu-stacks
diff --git a/infrastructure/cloudformation/dt/top.yaml b/infrastructure/cloudformation/dt/top.yaml
index 759e6b4..ea0d51b 100644
--- a/infrastructure/cloudformation/dt/top.yaml
+++ b/infrastructure/cloudformation/dt/top.yaml
@@ -90,7 +90,7 @@ Resources:
         release: !Ref release
         TaskManagerRole: !GetAtt IAM.Outputs.DefaultRole
         VpcId: !Ref VpcId
-        SubnetIds: !Ref PublicSubnets
+        SubnetIds: !Join [",", !Split [" ", !Ref PublicSubnets]]
 
   #------------
   # CloudWatch