diff --git a/libomptarget/CMakeLists.txt b/libomptarget/CMakeLists.txt
index 7060e20..31e475d 100644
--- a/libomptarget/CMakeLists.txt
+++ b/libomptarget/CMakeLists.txt
@@ -153,6 +153,8 @@
 
 # Add unit tests if GMock/GTest is present
 if (EXISTS ${LLVM_THIRD_PARTY_DIR}/unittest)
-  add_subdirectory(${LLVM_THIRD_PARTY_DIR}/unittest ${CMAKE_CURRENT_BINARY_DIR}/third-party/unittest)
+  if (NOT TARGET llvm_gtest)
+    add_subdirectory(${LLVM_THIRD_PARTY_DIR}/unittest ${CMAKE_CURRENT_BINARY_DIR}/third-party/unittest)
+  endif()
   add_subdirectory(unittests)
 endif()