diff --git a/src/Npgsql/GeneratedAsync.cs b/src/Npgsql/GeneratedAsync.cs
index 28345a6049..0b8e2e1944 100644
--- a/src/Npgsql/GeneratedAsync.cs
+++ b/src/Npgsql/GeneratedAsync.cs
@@ -337,7 +337,7 @@ async Task<object> ExecuteScalarInternalAsync(CancellationToken cancellationToke
             using (connector.StartUserAction(this))
             {
                 Log.Trace("ExecuteNonScalar", connector.Id);
-                using (var reader = Execute(CommandBehavior.SequentialAccess | CommandBehavior.SingleRow))
+                using (var reader = await (ExecuteAsync(cancellationToken, CommandBehavior.SequentialAccess | CommandBehavior.SingleRow)))
                     return await (reader.ReadAsync(cancellationToken)) && reader.FieldCount != 0 ? reader.GetValue(0) : null;
             }
         }
diff --git a/src/Npgsql/project.json b/src/Npgsql/project.json
index 8809715f65..8d3e767ac2 100644
--- a/src/Npgsql/project.json
+++ b/src/Npgsql/project.json
@@ -63,7 +63,7 @@
     }
   },
   "tools": {
-    "dotnet-rewrite-async": "0.8.7"
+    "dotnet-rewrite-async": "0.8.10"
   },
   "frameworks": {
     "net45": {