diff --git a/include/fmt/format.h b/include/fmt/format.h
index 0c3231b5f87e..98bfade459d3 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -3888,7 +3888,8 @@ template <typename T> auto ptr(T p) -> const void* {
   static_assert(std::is_pointer<T>::value, "");
   return detail::bit_cast<const void*>(p);
 }
-template <typename T> auto ptr(const std::unique_ptr<T>& p) -> const void* {
+template <typename T, typename Deleter>
+auto ptr(const std::unique_ptr<T, Deleter>& p) -> const void* {
   return p.get();
 }
 template <typename T> auto ptr(const std::shared_ptr<T>& p) -> const void* {
diff --git a/test/format-test.cc b/test/format-test.cc
index 4db3c9c49356..49b5f54107d6 100644
--- a/test/format-test.cc
+++ b/test/format-test.cc
@@ -1508,6 +1508,12 @@ TEST(format_test, format_pointer) {
   std::unique_ptr<int> up(new int(1));
   EXPECT_EQ(fmt::format("{}", fmt::ptr(up.get())),
             fmt::format("{}", fmt::ptr(up)));
+  struct custom_deleter {
+    void operator()(int* p) const { delete p; }
+  };
+  std::unique_ptr<int, custom_deleter> upcd(new int(1));
+  EXPECT_EQ(fmt::format("{}", fmt::ptr(upcd.get())),
+            fmt::format("{}", fmt::ptr(upcd)));
   std::shared_ptr<int> sp(new int(1));
   EXPECT_EQ(fmt::format("{}", fmt::ptr(sp.get())),
             fmt::format("{}", fmt::ptr(sp)));