diff --git a/src/webgpu/shader/execution/expression/expression.ts b/src/webgpu/shader/execution/expression/expression.ts
index 1b9815117f89..29bb8d93674e 100644
--- a/src/webgpu/shader/execution/expression/expression.ts
+++ b/src/webgpu/shader/execution/expression/expression.ts
@@ -867,7 +867,7 @@ ${body}
       // Runtime eval
       //////////////////////////////////////////////////////////////////////////
       let operation = '';
-      if (inputSource === 'storage_rw') {
+      if (inputSource === 'storage_rw' && objectEquals(resultType, storageType(resultType))) {
         operation = `
         outputs[i].value = ${storageType(resultType)}(inputs[i].lhs);
         outputs[i].value ${op} ${rhsType}(inputs[i].rhs);`;