diff --git a/fmt/format.h b/fmt/format.h
index 123dd207..3f011661 100644
--- a/fmt/format.h
+++ b/fmt/format.h
@@ -1395,14 +1395,9 @@ class MakeValue : public Arg {
   }
 
   template <typename T>
-  MakeValue(const T &value,
-            typename EnableIf<ConvertToInt<T>::value, int>::type = 0) {
-    int_value = value;
-  }
-
-  template <typename T>
-  static uint64_t type(const T &) {
-    return ConvertToInt<T>::value ? Arg::INT : Arg::CUSTOM;
+  static typename EnableIf<Not<ConvertToInt<T>::value>::value, uint64_t>::type
+      type(const T &) {
+    return Arg::CUSTOM;
   }
 
   // Additional template param `Char_` is needed here because make_type always
diff --git a/test/format-test.cc b/test/format-test.cc
index 852c91da..6388d5a5 100644
--- a/test/format-test.cc
+++ b/test/format-test.cc
@@ -1234,6 +1234,16 @@ TEST(FormatterTest, FormatIntLocale) {
   EXPECT_EQ("1--234--567", format("{:n}", 1234567));
 }
 
+struct ConvertibleToLongLong {
+  operator fmt::LongLong() const {
+    return fmt::LongLong(1) << 32;
+  }
+};
+
+TEST(FormatterTest, FormatConvertibleToLongLong) {
+  EXPECT_EQ("100000000", format("{:x}", ConvertibleToLongLong()));
+}
+
 TEST(FormatterTest, FormatFloat) {
   EXPECT_EQ("392.500000", format("{0:f}", 392.5f));
 }