diff --git a/CMLibBreathe.cmake b/CMLibBreathe.cmake
index b082331..f995488 100644
--- a/CMLibBreathe.cmake
+++ b/CMLibBreathe.cmake
@@ -16,7 +16,7 @@ if (PYTHONINTERP_FOUND)
     set(BREATHE_FOUND OFF CACHE STRING "Breathe documentation generator disabled" FORCE)
   endif()
 else()
-  set(BREATHE_FOUND OFF CACHE FORCE)
+  set(BREATHE_FOUND OFF CACHE STRING "Breathe documentation generator disabled" FORCE)
 endif()