diff --git a/tests/unit/unittest/projectupdater-test.cpp b/tests/unit/unittest/projectupdater-test.cpp
index 1b9f271687d..52e68b308cf 100644
--- a/tests/unit/unittest/projectupdater-test.cpp
+++ b/tests/unit/unittest/projectupdater-test.cpp
@@ -316,7 +316,7 @@ TEST_F(ProjectUpdater, ProjectPartIdsPrefetchingInsideTransaction)
                                             settingsManager};
 
     EXPECT_CALL(mockSqliteTransactionBackend, deferredBegin());
-    EXPECT_CALL(mockProjectPartsStorage, fetchProjectPartIdUnguarded(Eq(projectPartName)));
+    EXPECT_CALL(mockProjectPartsStorage, fetchProjectPartIdUnguarded(Eq(projectPartName))).WillOnce(Return(1));
     EXPECT_CALL(mockSqliteTransactionBackend, commit());
 
     updater.fetchProjectPartIds({&projectPart});