diff --git a/CMakeLists.txt b/CMakeLists.txt
index b5442af..129faf9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,7 +8,7 @@ set(CMAKE_CXX_EXTENSIONS OFF)
 
 # --- Source & header setup ---
 add_executable(implementation implementation/implementation.cpp)
-target_include_directories(implementation PRIVATE header)
+target_include_directories(implementation INTERFACE header)
 
 # --- GoogleTest setup via FetchContent ---
 include(FetchContent)