diff --git a/cpp/CMakeLists.txt b/cpp/CMakeLists.txt
index 4ed9529a36..122c03814a 100644
--- a/cpp/CMakeLists.txt
+++ b/cpp/CMakeLists.txt
@@ -175,6 +175,7 @@ endif()
 add_library(raft INTERFACE)
 add_library(raft::raft ALIAS raft)
 
+message(WARNING "\${RAFT_SOURCE_DIR}/include: ${RAFT_SOURCE_DIR}/include")
 target_include_directories(
   raft INTERFACE "$<BUILD_INTERFACE:${RAFT_SOURCE_DIR}/include>" "$<INSTALL_INTERFACE:include>"
 )