Set VulkanHeaders_INCLUDE_DIRS even when target Vulkan::Headers is defined
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 85bddd6..81532fd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,6 +31,7 @@
 
 if (TARGET Vulkan::Headers)
     message(STATUS "Using Vulkan headers from Vulkan::Headers target")
+    get_target_property(VulkanHeaders_INCLUDE_DIRS Vulkan::Headers INTERFACE_INCLUDE_DIRECTORIES)
     get_target_property(VulkanRegistry_DIR Vulkan::Registry INTERFACE_INCLUDE_DIRECTORIES)
 else()
     find_package(VulkanHeaders)