diff --git a/src/lib/tests/CMakeLists.txt b/src/lib/tests/CMakeLists.txt
index 04176ea1..083c149b 100644
--- a/src/lib/tests/CMakeLists.txt
+++ b/src/lib/tests/CMakeLists.txt
@@ -1,18 +1,18 @@
 cmake_minimum_required (VERSION 3.11)
 
-add_library (pg_test)
+add_library (pg_test OBJECT)
 target_sources(pg_test PRIVATE PGManagerTest.cpp)
 target_link_libraries(pg_test
     ${COMMON_TEST_DEPS}
   )
 
-add_library (shard_test)
+add_library (shard_test OBJECT)
 target_sources(shard_test PRIVATE ShardManagerTest.cpp)
 target_link_libraries(shard_test
     ${COMMON_TEST_DEPS}
   )
 
-add_library (blob_test)
+add_library (blob_test OBJECT)
 target_sources(blob_test PRIVATE BlobManagerTest.cpp)
 target_link_libraries(blob_test
     ${COMMON_TEST_DEPS}