diff --git a/llvm/lib/Support/CMakeLists.txt b/llvm/lib/Support/CMakeLists.txt
index 41eb19a97cb9..5eccf59d81a1 100644
--- a/llvm/lib/Support/CMakeLists.txt
+++ b/llvm/lib/Support/CMakeLists.txt
@@ -397,7 +397,7 @@ target_include_directories(LLVMSupport
 )
 
 # Integrating LLVM libc's math functions
-target_include_directories(LLVMSupport PRIVATE "${LLVM_INCLUDE_DIR}/../../libc")
+target_include_directories(LLVMSupport PRIVATE "${LLVM_SOURCE_DIR}/../libc")
 if(NOT MSVC)
   target_compile_options(LLVMSupport PRIVATE "-Wno-c99-extensions") # _Complex warnings.
 endif()