diff --git a/include/rocksdb/cache.h b/include/rocksdb/cache.h
index 3e0e5c1cd..201d82f19 100644
--- a/include/rocksdb/cache.h
+++ b/include/rocksdb/cache.h
@@ -102,7 +102,7 @@ class Cache {
   virtual uint64_t NewId() = 0;
 
   // returns the maximum configured capacity of the cache
-  virtual size_t GetCapacity() = 0;
+  virtual size_t GetCapacity() const = 0;
 
  private:
   void LRU_Remove(Handle* e);
diff --git a/util/cache.cc b/util/cache.cc
index deec52864..b9d41be49 100644
--- a/util/cache.cc
+++ b/util/cache.cc
@@ -404,7 +404,7 @@ class ShardedLRUCache : public Cache {
     MutexLock l(&id_mutex_);
     return ++(last_id_);
   }
-  virtual size_t GetCapacity() {
+  virtual size_t GetCapacity() const {
     return capacity_;
   }
 };