diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5d6c1420d..5c8a23f26 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -167,6 +167,8 @@ endif()
 # this is going to be true for anything lacking pkg-config/CMake support.
 # unigbrk.h was introduced in libunistring 0.9.4, 2010-02-14.
 unset(HAVE_UNISTRING_H CACHE)
+find_path(UNISTRING_INCLUDE unigbrk.h)
+set(CMAKE_REQUIRED_INCLUDES ${UNISTRING_INCLUDE})
 check_include_file("unigbrk.h" HAVE_UNISTRING_H)
 if(NOT "${HAVE_UNISTRING_H}")
   message(FATAL_ERROR "Couldn't find unigbrk.h from GNU libunistring")