diff --git a/types/emscripten/index.d.ts b/types/emscripten/index.d.ts
index 5a9bbb1444..5da83ae2b5 100644
--- a/types/emscripten/index.d.ts
+++ b/types/emscripten/index.d.ts
@@ -3,7 +3,12 @@
 // Definitions by: Kensuke Matsuzaki <https://github.com/zakki>
 //                 Periklis Tsirakidis <https://github.com/periklis>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-// TypeScript Version: 3.5
+// TypeScript Version: 2.2
+
+/** Other WebAssembly declarations, for compatibility with older versions of Typescript */
+declare namespace WebAssembly {
+    interface Module { }
+}
 
 declare namespace Emscripten {
     interface FileSystemType {
diff --git a/types/webassembly-web-api/index.d.ts b/types/webassembly-web-api/index.d.ts
index e5e35c5ad5..8958b4fca7 100644
--- a/types/webassembly-web-api/index.d.ts
+++ b/types/webassembly-web-api/index.d.ts
@@ -2,7 +2,7 @@
 // Project: https://webassembly.org/
 // Definitions by: Johannes Henninger <https://github.com/jhenninger>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-// TypeScript Version: 3.5
+// TypeScript Version: 2.2
 
 /**
  *  The WebAssembly Web API defines extensions to the JavaScript API made
@@ -10,6 +10,11 @@
  *  API](https://www.w3.org/TR/wasm-web-api-1/) for more information.
  */
 declare namespace WebAssembly {
+    /// Other WebAssembly declarations, for compatibility with older versions of Typescript
+    // tslint:disable-next-line no-empty-interface
+    interface Module { }
+    // tslint:disable-next-line no-empty-interface
+    interface Instance { }
     interface ResultObject {
         module: Module;
         instance: Instance;