diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9d1e14f1f..6e1ac775b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -829,7 +829,7 @@ target_include_directories(
          $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/include/>
          $<BUILD_INTERFACE:${CMAKE_CURRENT_LIST_DIR}/include/>
          $<INSTALL_INTERFACE:include/>
-         $<$<AND:$<BOOL:${COAP_WITH_LIBTINYDTLS}>,$<BOOL:${USE_VENDORED_TINYDTLS}>>:${CMAKE_BINARY_DIR}/include/tinydtls>
+         $<BUILD_INTERFACE:$<$<AND:$<BOOL:${COAP_WITH_LIBTINYDTLS}>,$<BOOL:${USE_VENDORED_TINYDTLS}>>:${CMAKE_BINARY_DIR}/include/tinydtls>>
          $<$<BOOL:${COAP_WITH_LIBGNUTLS}>:${GNUTLS_INCLUDE_DIR}>
          $<$<BOOL:${COAP_WITH_LIBMBEDTLS}>:${MBEDTLS_INCLUDE_DIRS}>
          $<$<BOOL:${COAP_WITH_LIBWOLFSSL}>:${WOLFSSL_INCLUDE_DIR}>)