diff --git a/pkgs/wasm-interpreter.nix b/pkgs/wasm-interpreter.nix
index 7455665a..2fd7ccff 100644
--- a/pkgs/wasm-interpreter.nix
+++ b/pkgs/wasm-interpreter.nix
@@ -13,7 +13,7 @@ rustPlatform.buildRustPackage rec {
       src = ./..;
 
       # File suffices to include
-      extensions = [ "lock" "rs" "toml" ];
+      extensions = [ "lock" "rs" "toml" "wast" ];
       # Files to explicitly include
       include = [ ];
       # Files to explicitly exclude