diff --git a/mirai-core-mock/src/internal/MockBotImpl.kt b/mirai-core-mock/src/internal/MockBotImpl.kt
index df36f7956c..0e7e67fe15 100644
--- a/mirai-core-mock/src/internal/MockBotImpl.kt
+++ b/mirai-core-mock/src/internal/MockBotImpl.kt
@@ -185,7 +185,12 @@ internal class MockBotImpl(
         val md5 = resource.md5
         val format = resource.formatName
 
-        return MockImage(generateImageId(md5, format), bot.tmpResourceServer.uploadResourceAsImage(resource).toString())
+        // todo width, height ?
+        return MockImage(
+            imageId = generateImageId(md5, format),
+            urlPath = bot.tmpResourceServer.uploadResourceAsImage(resource).toString(),
+            size = resource.size
+        )
     }
 
     override fun toString(): String {
diff --git a/mirai-core-mock/test/ImageUploadTest.kt b/mirai-core-mock/test/ImageUploadTest.kt
index ab0aeaf6f9..fb4bd8f75b 100644
--- a/mirai-core-mock/test/ImageUploadTest.kt
+++ b/mirai-core-mock/test/ImageUploadTest.kt
@@ -20,6 +20,7 @@ import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.TestInstance
 import java.net.URL
 import kotlin.test.assertEquals
+import kotlin.test.assertNotEquals
 import kotlin.test.assertTrue
 
 @TestInstance(TestInstance.Lifecycle.PER_METHOD)
@@ -44,6 +45,7 @@ internal class ImageUploadTest {
         assertTrue {
             data.contentEquals(URL(img.queryUrl()).readBytes())
         }
+        assertNotEquals(0, img.size)
     }
 
     @Test