diff --git a/Project.toml b/Project.toml
index 8a18828..4cecf13 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "MultiThreadedCaches"
 uuid = "18056a9e-ed0c-4ef3-9ad7-376a7fb08032"
 authors = ["Nathan Daly <nhdaly@gmail.com> and contributors"]
-version = "0.1.4"
+version = "0.1.5"
 
 [compat]
 julia = "1.3"
diff --git a/src/MultiThreadedCaches.jl b/src/MultiThreadedCaches.jl
index 7cc7c08..714271f 100644
--- a/src/MultiThreadedCaches.jl
+++ b/src/MultiThreadedCaches.jl
@@ -118,7 +118,8 @@ function _thread_lock(cache::MultiThreadedCache, tid)
 end
 
 
-const CACHE_MISS = :__MultiThreadedCaches_key_not_found__
+struct NeverCached end
+const CACHE_MISS = NeverCached()
 
 function Base.get!(func::Base.Callable, cache::MultiThreadedCache{K,V}, key) where {K,V}
     # If the thread-local cache has the value, we can return immediately.