diff --git a/include/sigar_util.h b/include/sigar_util.h
index 754f549b..36049eeb 100644
--- a/include/sigar_util.h
+++ b/include/sigar_util.h
@@ -83,4 +83,11 @@ typedef struct {
     void (*free_value)(void *ptr);
 } sigar_cache_t;
 
+sigar_cache_t *sigar_cache_new(int size);
+
+sigar_cache_entry_t *sigar_cache_get(sigar_cache_t *table,
+                                     sigar_uint64_t key);
+
+void sigar_cache_destroy(sigar_cache_t *table);
+
 #endif /* SIGAR_UTIL_H */