diff --git a/llvm/lib/Support/CMakeLists.txt b/llvm/lib/Support/CMakeLists.txt
index 36919b25b0eff..ddacb4feaa0f2 100644
--- a/llvm/lib/Support/CMakeLists.txt
+++ b/llvm/lib/Support/CMakeLists.txt
@@ -274,5 +274,8 @@ if(LLVM_INTEGRATED_CRT_ALLOC)
 endif()
 
 if(LLVM_WITH_Z3)
-  include_directories(SYSTEM ${Z3_INCLUDE_DIR})
+  target_include_directories(LLVMSupport SYSTEM
+    PRIVATE
+    ${Z3_INCLUDE_DIR}
+    )
 endif()