diff --git a/src/include/c.h b/src/include/c.h
index de9ec04d49..d21cd71f0b 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -360,6 +360,8 @@ typedef void (*pg_funcptr_t) (void);
  */
 #define FLEXIBLE_ARRAY_MEMBER	/* empty */
 
+/* For backwards compatibility */
+#define PG_FUNCNAME_MACRO __func__
 
 /* ----------------------------------------------------------------
  *				Section 2:	bool, true, false