diff --git a/llvm/unittests/ADT/CMakeLists.txt b/llvm/unittests/ADT/CMakeLists.txt
--- a/llvm/unittests/ADT/CMakeLists.txt
+++ b/llvm/unittests/ADT/CMakeLists.txt
@@ -84,6 +84,10 @@
   TypeTraitsTest.cpp
   )
 
-target_link_libraries(ADTTests PRIVATE LLVMTestingSupport)
+target_link_libraries(ADTTests
+  PRIVATE
+  LLVMTestingSupport
+  ${LLVM_ATOMIC_LIB}
+)
 
 add_dependencies(ADTTests intrinsics_gen)