diff --git a/CMLibBreathe.cmake b/CMLibBreathe.cmake
index f995488..56cebb3 100644
--- a/CMLibBreathe.cmake
+++ b/CMLibBreathe.cmake
@@ -27,6 +27,7 @@ function(add_breathe_target)
     set(multiValueArgs)
 
     cmake_parse_arguments(_BREATHE "${options}" "${oneValueArgs}" "${multiValueArgs}" ${ARGN})
+    set(BREATHE_DOCS_BUILD_DIR ${_BREATHE_BUILD_DIR})
 
     configure_file(${_BREATHE_CONF_FILE} ${_BREATHE_BUILD_DIR}/conf.py @ONLY)
     configure_file(${_BREATHE_DOXY_FILE} ${_BREATHE_BUILD_DIR}/Doxyfile @ONLY)