diff --git a/codecs/rotate/rotate.ts b/codecs/rotate/rotate.as
similarity index 96%
rename from codecs/rotate/rotate.ts
rename to codecs/rotate/rotate.as
index a8f184c4..b3466b39 100644
--- a/codecs/rotate/rotate.ts
+++ b/codecs/rotate/rotate.as
@@ -56,7 +56,7 @@ export function rotate(inputWidth: i32, inputHeight: i32, rotate: i32): void {
   for (let d2 = d2Start; d2 >= 0 && d2 < d2Limit; d2 += d2Advance) {
     for (let d1 = d1Start; d1 >= 0 && d1 < d1Limit; d1 += d1Advance) {
       let start = ((d1 * d1Multiplier) + (d2 * d2Multiplier));
-      store<u32>(offset + i, load<u32>(start));
+      store<u32>(offset + i * 4, load<u32>(start * 4));
       i += 1;
     }
   }
diff --git a/codecs/rotate/rotate.wasm b/codecs/rotate/rotate.wasm
index 730041fd..a1c76a21 100644
Binary files a/codecs/rotate/rotate.wasm and b/codecs/rotate/rotate.wasm differ
diff --git a/codecs/rotate/tsconfig.json b/codecs/rotate/tsconfig.json
index c614e5c8..29b04405 100644
--- a/codecs/rotate/tsconfig.json
+++ b/codecs/rotate/tsconfig.json
@@ -1,6 +1,6 @@
 {
-  "extends": "../node_modules/assemblyscript/std/assembly.json",
+  "extends": "./node_modules/assemblyscript/std/assembly.json",
   "include": [
     "./**/*.ts"
   ]
-}
\ No newline at end of file
+}
diff --git a/src/codecs/rotate/processor-meta.ts b/src/codecs/rotate/processor-meta.ts
index 854bcafa..1b70ccdd 100644
--- a/src/codecs/rotate/processor-meta.ts
+++ b/src/codecs/rotate/processor-meta.ts
@@ -3,3 +3,10 @@ export interface RotateOptions {
 }
 
 export const defaultOptions: RotateOptions = { rotate: 0 };
+
+export interface RotateModuleInstance {
+  exports: {
+    memory: WebAssembly.Memory;
+    rotate(width: number, height: number, rotate: 0 | 90 | 180 | 270): void;
+  };
+}