diff --git a/tests/core/t_size.expected b/tests/core/t_size.expected
index b45d61a1..c779db73 100644
--- a/tests/core/t_size.expected
+++ b/tests/core/t_size.expected
@@ -1,21 +1,7 @@
-metrics size: 243B
-res1: { resource =
-          Some(
-            { attributes =
-                [{ key = "service.name";
-                   value = Some(String_value("unknown_service"));
-                 }
-                 ];
-              dropped_attributes_count = 0;
-            });
+metrics size: 171B
+res1: { resource = None;
         scope_metrics =
-          [{ scope =
-               Some(
-                 { name = "ocaml-otel";
-                   version = "%%VERSION_NUM%%";
-                   attributes = [];
-                   dropped_attributes_count = 0;
-                 });
+          [{ scope = None;
              metrics =
                [{ name = "sum.foo";
                   description = "";
@@ -72,23 +58,9 @@ res1: { resource =
            ];
         schema_url = "";
       }
-res1: { resource =
-          Some(
-            { attributes =
-                [{ key = "service.name";
-                   value = Some(String_value("unknown_service"));
-                 }
-                 ];
-              dropped_attributes_count = 0;
-            });
+res1: { resource = None;
         scope_metrics =
-          [{ scope =
-               Some(
-                 { name = "ocaml-otel";
-                   version = "%%VERSION_NUM%%";
-                   attributes = [];
-                   dropped_attributes_count = 0;
-                 });
+          [{ scope = None;
              metrics =
                [{ name = "sum.foo";
                   description = "";
diff --git a/tests/core/t_size.ml b/tests/core/t_size.ml
index bda2e186..c7b1bce1 100644
--- a/tests/core/t_size.ml
+++ b/tests/core/t_size.ml
@@ -2,20 +2,27 @@
 
 open Opentelemetry
 
-let res1 =
-  Metrics.make_resource_metrics
-    [
-      Metrics.sum ~name:"sum.foo"
-        [
-          Metrics.int ~start_time_unix_nano:42L ~now:45L 10;
-          Metrics.int ~start_time_unix_nano:52L ~now:55L 20;
-        ];
-      Metrics.gauge ~name:"gauge.bar"
-        [
-          Metrics.float ~start_time_unix_nano:42L ~now:45L 10.;
-          Metrics.float ~start_time_unix_nano:52L ~now:55L 20.;
-        ];
-    ]
+let res1 : Proto.Metrics.resource_metrics =
+  Proto.Metrics.make_resource_metrics ~schema_url:""
+    ~scope_metrics:
+      [
+        Proto.Metrics.make_scope_metrics ~schema_url:""
+          ~metrics:
+            [
+              Metrics.sum ~name:"sum.foo"
+                [
+                  Metrics.int ~start_time_unix_nano:42L ~now:45L 10;
+                  Metrics.int ~start_time_unix_nano:52L ~now:55L 20;
+                ];
+              Metrics.gauge ~name:"gauge.bar"
+                [
+                  Metrics.float ~start_time_unix_nano:42L ~now:45L 10.;
+                  Metrics.float ~start_time_unix_nano:52L ~now:55L 20.;
+                ];
+            ]
+          ();
+      ]
+    ()
 
 let str =
   let enc = Pbrt.Encoder.create () in