diff --git a/src/test/app/HostFuncImpl_test.cpp b/src/test/app/HostFuncImpl_test.cpp
index e07622a6f1..aede035a50 100644
--- a/src/test/app/HostFuncImpl_test.cpp
+++ b/src/test/app/HostFuncImpl_test.cpp
@@ -1315,7 +1315,7 @@ struct HostFuncImpl_test : public beast::unit_test::suite
         // Should succeed for small data
         std::vector<uint8_t> data(10, 0x42);
         auto const result = hfs.updateData(Slice(data.data(), data.size()));
-        BEAST_EXPECT(result.has_value() && result.value() == 0);
+        BEAST_EXPECT(result.has_value() && result.value() == data.size());
 
         // Should fail for too large data
         std::vector<uint8_t> bigData(
diff --git a/src/xrpld/app/wasm/detail/HostFuncImpl.cpp b/src/xrpld/app/wasm/detail/HostFuncImpl.cpp
index f6517767dc..ca87b4fe30 100644
--- a/src/xrpld/app/wasm/detail/HostFuncImpl.cpp
+++ b/src/xrpld/app/wasm/detail/HostFuncImpl.cpp
@@ -431,7 +431,7 @@ WasmHostFunctionsImpl::updateData(Slice const& data)
         return Unexpected(HostFunctionError::DATA_FIELD_TOO_LARGE);
     }
     data_ = Bytes(data.begin(), data.end());
-    return 0;
+    return data_.size();
 }
 
 Expected<int32_t, HostFunctionError>