diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0f37254..a8a2e93 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -7,5 +7,4 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")
 include(InitializeSwift)
 include(AddSwift)
 
-include_directories("${CMAKE_CURRENT_SOURCE_DIR}/Sources/CppBackend")
 add_subdirectory(Sources)
diff --git a/Sources/CppBackend/CMakeLists.txt b/Sources/CppBackend/CMakeLists.txt
index 6028792..3458033 100644
--- a/Sources/CppBackend/CMakeLists.txt
+++ b/Sources/CppBackend/CMakeLists.txt
@@ -2,3 +2,4 @@ add_library(CppBackend STATIC backend.h backend.cpp)
 
 set_target_properties(CppBackend PROPERTIES Swift_MODULE_NAME "CppBackend")
 target_compile_options(CppBackend PUBLIC "$<$<COMPILE_LANGUAGE:Swift>:-cxx-interoperability-mode=default>")
+target_include_directories(CppBackend PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}")