diff --git a/oving5/CMakeLists.txt b/oving5/CMakeLists.txt
index a07b7e4..af2ffa0 100644
--- a/oving5/CMakeLists.txt
+++ b/oving5/CMakeLists.txt
@@ -4,10 +4,10 @@ project(c C)
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c11 -Wall -Wextra")
 
 add_library(format_string STATIC format_string.c)
-target_include_directories(format_string INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
+target_include_directories(format_string PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
 
 add_executable(c main.c)
-target_link_libraries(c PRIVATE format_string)  # Use PRIVATE here
+target_link_libraries(c PRIVATE format_string)
 
 enable_testing()
 add_subdirectory(tests)