diff --git a/fmt/ostream.h b/fmt/ostream.h
index d01c1ab4..0e13a084 100644
--- a/fmt/ostream.h
+++ b/fmt/ostream.h
@@ -116,6 +116,7 @@ void format_arg(BasicFormatter<Char, ArgFormatter> &f,
 FMT_API void print(std::ostream &os, CStringRef format_str, ArgList args);
 FMT_VARIADIC(void, print, std::ostream &, CStringRef)
 
+#if __cplusplus >= 201103L
 template<typename T, typename Char>
 typename std::enable_if<
  !std::is_same<
@@ -139,6 +140,7 @@ operator<<(BasicWriter<Char> &writer, const T &value) {
   buffer.resize(buffer.size() + format_buf.size());
   return writer;
 }
+#endif
 }  // namespace fmt
 
 #ifdef FMT_HEADER_ONLY
diff --git a/test/ostream-test.cc b/test/ostream-test.cc
index 8f4f6a2c..8891ae24 100644
--- a/test/ostream-test.cc
+++ b/test/ostream-test.cc
@@ -111,7 +111,10 @@ std::ostream &operator<<(std::ostream &os, EmptyTest) {
   return os << "";
 }
 
+#if __cplusplus >= 201103L
 struct UserDefinedTest { int i = 42; };
+#endif
+
 std::ostream &operator<<(std::ostream &os, const UserDefinedTest &u) {
   return os << u.i;
 }
@@ -134,6 +137,7 @@ TEST(OStreamTest, WriteToOStream) {
   EXPECT_EQ("foo", os.str());
 }
 
+#if __cplusplus >= 201103L
 TEST(OStreamTest, WriteUserDefinedTypeToOStream) {
   std::ostringstream os;
   fmt::MemoryWriter w;
@@ -142,6 +146,7 @@ TEST(OStreamTest, WriteUserDefinedTypeToOStream) {
   fmt::internal::write(os, w);
   EXPECT_EQ("The answer is 42", os.str());
 }
+#endif
 
 TEST(OStreamTest, WriteToOStreamMaxSize) {
   std::size_t max_size = std::numeric_limits<std::size_t>::max();