diff --git a/llvm/lib/CAS/CMakeLists.txt b/llvm/lib/CAS/CMakeLists.txt
index cc866f25f3240..7ae5f7e46418e 100644
--- a/llvm/lib/CAS/CMakeLists.txt
+++ b/llvm/lib/CAS/CMakeLists.txt
@@ -12,6 +12,9 @@ add_llvm_component_library(LLVMCAS
   ADDITIONAL_HEADER_DIRS
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/CAS
 
+  LINK_LIBS
+  ${LLVM_PTHREAD_LIB}
+
   LINK_COMPONENTS
   Support
 )