diff --git a/test/firmware_writemeta_unittest.cpp b/test/firmware_writemeta_unittest.cpp
index b2338c1..13399fb 100644
--- a/test/firmware_writemeta_unittest.cpp
+++ b/test/firmware_writemeta_unittest.cpp
@@ -53,6 +53,7 @@
 
     auto handler = FirmwareBlobHandler::CreateFirmwareBlobHandler(blobs, data);
 
+    EXPECT_CALL(dataMock, open()).WillOnce(Return(true));
     EXPECT_CALL(imageMock2, open("asdf")).WillOnce(Return(true));
 
     EXPECT_TRUE(handler->open(