diff --git a/examples/insert_bench.cc b/examples/insert_bench.cc
index 1ab9517..5dfb0a1 100644
--- a/examples/insert_bench.cc
+++ b/examples/insert_bench.cc
@@ -137,5 +137,5 @@ int main()
             checksum += ++map[static_cast<int>(rng())];
         }
     }
-    printf("%d\n", checksum);
+    printf("%zu\n", checksum);
 }
diff --git a/parallel_hashmap/phmap_base.h b/parallel_hashmap/phmap_base.h
index 332e5a0..d08951c 100644
--- a/parallel_hashmap/phmap_base.h
+++ b/parallel_hashmap/phmap_base.h
@@ -4625,9 +4625,9 @@ class Lockable : public Mutex, public LockableBase<Mutex>
 {
 public:
     using Base            = LockableBase<Mutex>;
-    using SharedLock      = Base::ScopedLock;
-    using UniqueLock      = Base::ScopedLock;
-    using UpgradeToUnique = Base::DoNothing;        // we already have unique ownership
+    using SharedLock      = typename Base::ScopedLock;
+    using UniqueLock      = typename Base::ScopedLock;
+    using UpgradeToUnique = typename Base::DoNothing;        // we already have unique ownership
 };
 
 #if defined(BOOST_THREAD_SHARED_MUTEX_HPP) && defined(BOOST_THREAD_LOCK_TYPES_HPP)