diff --git a/NEWS.md b/NEWS.md
index 283dd349..98cbe46b 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,8 @@
 # clock (development version)
 
+* Fixed `-Wdeprecated-literal-operator` reported by clang (#386,
+  @MichaelChirico).
+
 # clock 0.7.2
 
 * Added a `diff()` method for time points and calendars to ensure that durations
diff --git a/src/ordinal.h b/src/ordinal.h
index d25e3911..19ce1d48 100644
--- a/src/ordinal.h
+++ b/src/ordinal.h
@@ -237,8 +237,8 @@ operator<<(std::basic_ostream<CharT, Traits>& os, const year_yearday_last& yydl)
 inline namespace literals
 {
 
-CONSTCD11 ordinal::yearday operator "" _yd(unsigned long long yd) NOEXCEPT;
-CONSTCD11 ordinal::year    operator "" _y(unsigned long long y) NOEXCEPT;
+CONSTCD11 ordinal::yearday operator ""_yd(unsigned long long yd) NOEXCEPT;
+CONSTCD11 ordinal::year    operator ""_y(unsigned long long y) NOEXCEPT;
 
 }  // inline namespace literals
 #endif // !defined(_MSC_VER) || (_MSC_VER >= 1900)
@@ -628,7 +628,7 @@ inline namespace literals
 CONSTCD11
 inline
 ordinal::yearday
-operator "" _yd(unsigned long long yd) NOEXCEPT
+operator ""_yd(unsigned long long yd) NOEXCEPT
 {
     return ordinal::yearday{static_cast<unsigned>(yd)};
 }
@@ -636,7 +636,7 @@ operator "" _yd(unsigned long long yd) NOEXCEPT
 CONSTCD11
 inline
 ordinal::year
-operator "" _y(unsigned long long y) NOEXCEPT
+operator ""_y(unsigned long long y) NOEXCEPT
 {
     return ordinal::year(static_cast<int>(y));
 }
diff --git a/src/week.h b/src/week.h
index 238fa316..ad094443 100644
--- a/src/week.h
+++ b/src/week.h
@@ -877,7 +877,7 @@ inline namespace literals
 CONSTCD11
 inline
 week::weeknum
-operator "" _w(unsigned long long wn) NOEXCEPT
+operator ""_w(unsigned long long wn) NOEXCEPT
 {
     return week::weeknum(static_cast<unsigned>(wn));
 }