diff --git a/src/mono/wasm/runtime/diagnostics.ts b/src/mono/wasm/runtime/diagnostics.ts
index 6e675ff0de5afb..c7d23d2cf1e7b5 100644
--- a/src/mono/wasm/runtime/diagnostics.ts
+++ b/src/mono/wasm/runtime/diagnostics.ts
@@ -6,6 +6,7 @@ import * as memory from './memory';
 
 export interface EventPipeSession {
     get sessionID(): number;
+    start(): void;
     stop(): void;
     saveTrace(): string;
 
diff --git a/src/mono/wasm/runtime/dotnet.d.ts b/src/mono/wasm/runtime/dotnet.d.ts
index 2f6aefa2bdaf08..7aa69ea4d514df 100644
--- a/src/mono/wasm/runtime/dotnet.d.ts
+++ b/src/mono/wasm/runtime/dotnet.d.ts
@@ -240,6 +240,7 @@ declare type DotnetModuleConfigImports = {
 
 interface EventPipeSession {
     get sessionID(): number;
+    start(): void;
     stop(): void;
     saveTrace(): string;
 }