diff --git a/src/core/lib/FileSignatures.mjs b/src/core/lib/FileSignatures.mjs
index bc80526c..4d817326 100644
--- a/src/core/lib/FileSignatures.mjs
+++ b/src/core/lib/FileSignatures.mjs
@@ -2531,6 +2531,7 @@ export const FILE_SIGNATURES = {
         {
             name: "WebAssembly binary",
             extension: "wasm",
+            mime: "application/octet-stream",
             description: "",
             signature: {
                 0: 0x00,