diff --git a/src/include/c.h b/src/include/c.h
index 7136102e5ff..13fbeea408e 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -154,7 +154,7 @@
  * common style is to put them before the return type.  (The MSVC fallback has
  * the same requirement.  The GCC fallback is more flexible.)
  */
-#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L) && !defined(__cplusplus)
 #define pg_noreturn _Noreturn
 #elif defined(__GNUC__)
 #define pg_noreturn __attribute__((noreturn))