diff --git a/tools/CMakeLists.txt b/tools/CMakeLists.txt
index 144e8ec3ea6..4cf5aa5105f 100644
--- a/tools/CMakeLists.txt
+++ b/tools/CMakeLists.txt
@@ -56,6 +56,7 @@ endif()
 
 add_llvm_external_project(clang)
 add_llvm_external_project(lld)
+add_llvm_external_project(lldb)
 add_llvm_external_project(polly)
 
 set(LLVM_COMMON_DEPENDS ${LLVM_COMMON_DEPENDS} PARENT_SCOPE)