diff --git a/src/policy_cache.hpp b/src/policy_cache.hpp
index 6cdb9280..ed83a43d 100644
--- a/src/policy_cache.hpp
+++ b/src/policy_cache.hpp
@@ -23,7 +23,7 @@
 
 #include <cstdint>
 #include <string>
-#include <map>
+#include <unordered_map>
 
 #include <pthread.h>