diff --git a/core/runtime.rs b/core/runtime.rs
index 7c70d43669..f6d6881867 100644
--- a/core/runtime.rs
+++ b/core/runtime.rs
@@ -466,14 +466,15 @@ impl JsRuntime {
       extensions: options.extensions,
     };
 
+    // Init resources and ops before extensions to make sure they are
+    // available during the initialization process.
+    js_runtime.init_extension_ops().unwrap();
     // TODO(@AaronO): diff extensions inited in snapshot and those provided
     // for now we assume that snapshot and extensions always match
     if !has_startup_snapshot {
       let realm = js_runtime.global_realm();
       js_runtime.init_extension_js(&realm).unwrap();
     }
-    // Init extension ops
-    js_runtime.init_extension_ops().unwrap();
     // Init callbacks (opresolve)
     let global_realm = js_runtime.global_realm();
     js_runtime.init_cbs(&global_realm);
diff --git a/runtime/ops/io.rs b/runtime/ops/io.rs
index ce2ed252f9..18c7fb5e51 100644
--- a/runtime/ops/io.rs
+++ b/runtime/ops/io.rs
@@ -124,7 +124,8 @@ pub fn init_stdio(stdio: Stdio) -> Extension {
         .take()
         .expect("Extension only supports being used once.");
       let t = &mut state.resource_table;
-      t.add(StdFileResource::stdio(
+
+      let rid = t.add(StdFileResource::stdio(
         match stdio.stdin {
           StdioPipe::Inherit => StdFileResourceInner {
             kind: StdFileResourceKind::Stdin,
@@ -134,7 +135,9 @@ pub fn init_stdio(stdio: Stdio) -> Extension {
         },
         "stdin",
       ));
-      t.add(StdFileResource::stdio(
+      assert_eq!(rid, 0, "stdin must have ResourceId 0");
+
+      let rid = t.add(StdFileResource::stdio(
         match stdio.stdout {
           StdioPipe::Inherit => StdFileResourceInner {
             kind: StdFileResourceKind::Stdout,
@@ -144,7 +147,9 @@ pub fn init_stdio(stdio: Stdio) -> Extension {
         },
         "stdout",
       ));
-      t.add(StdFileResource::stdio(
+      assert_eq!(rid, 1, "stdout must have ResourceId 1");
+
+      let rid = t.add(StdFileResource::stdio(
         match stdio.stderr {
           StdioPipe::Inherit => StdFileResourceInner {
             kind: StdFileResourceKind::Stderr,
@@ -154,6 +159,7 @@ pub fn init_stdio(stdio: Stdio) -> Extension {
         },
         "stderr",
       ));
+      assert_eq!(rid, 2, "stderr must have ResourceId 2");
       Ok(())
     })
     .build()