diff --git a/examples/plugins/example/example.cpp b/examples/plugins/example/example.cpp
index 5b935cbe992..2a304c2098d 100644
--- a/examples/plugins/example/example.cpp
+++ b/examples/plugins/example/example.cpp
@@ -6,6 +6,7 @@
 // SPDX-FileCopyrightText: (c) 2021 The VAST Contributors
 // SPDX-License-Identifier: BSD-3-Clause
 
+#include "vast/concept/printable/vast/integer.hpp"
 #include "vast/data.hpp"
 #include "vast/error.hpp"
 #include "vast/logger.hpp"
@@ -74,7 +75,7 @@ example(example_actor::stateful_pointer<example_actor_state> self) {
       for (auto& [key, value] : config) {
         if (key == "max-events") {
           if (auto max_events = caf::get_if<integer>(&value)) {
-            VAST_VERBOSE("{} sets max-events to {}", self, max_events->value);
+            VAST_VERBOSE("{} sets max-events to {}", self, *max_events);
             self->state.max_events = max_events->value;
           }
         }
diff --git a/libvast/test/arrow_table_slice.cpp b/libvast/test/arrow_table_slice.cpp
index b6c4c86506c..a4365125490 100644
--- a/libvast/test/arrow_table_slice.cpp
+++ b/libvast/test/arrow_table_slice.cpp
@@ -74,7 +74,7 @@ enumeration operator"" _e(unsigned long long int x) {
 }
 
 integer operator"" _i(unsigned long long int x) {
-  return integer{static_cast<integer::value_type>(x)};
+  return integer{detail::narrow_cast<integer::value_type>(x)};
 }
 
 } // namespace
diff --git a/libvast/vast/data/integer.hpp b/libvast/vast/data/integer.hpp
index bc6fa0c967a..da649fea220 100644
--- a/libvast/vast/data/integer.hpp
+++ b/libvast/vast/data/integer.hpp
@@ -40,13 +40,12 @@ struct integer : detail::totally_ordered<integer> {
   friend typename Inspector::result_type inspect(Inspector& f, integer& x) {
     return f(caf::meta::type_name("vast.integer"), x.value);
   }
-};
 
-/// @relates integer
-template <class Hasher>
-void hash_append(Hasher& h, const integer& x) {
-  hash_append(h, x.value);
-}
+  template <class Hasher>
+  friend void hash_append(Hasher& h, const integer& x) {
+    hash_append(h, x.value);
+  }
+};
 
 } // namespace vast