diff --git a/ChangeLog b/ChangeLog
index 8f05b18f51..e7a68b3ac3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2017-06-22  Joseph Myers  <joseph@codesourcery.com>
 
+	* sysdeps/ieee754/ldbl-96/bits/iscanonical.h
+	[__HAVE_DISTINCT_FLOAT128] (__iscanonicalf128): New macro.
+
 	* sysdeps/generic/math-tests.h: Include <bits/floatn.h>.
 	(MATH_TESTS_TG): New macro.
 	(SNAN_TESTS_float128): Likewise.
diff --git a/sysdeps/ieee754/ldbl-96/bits/iscanonical.h b/sysdeps/ieee754/ldbl-96/bits/iscanonical.h
index 2c8b786183..4a4f4ad024 100644
--- a/sysdeps/ieee754/ldbl-96/bits/iscanonical.h
+++ b/sysdeps/ieee754/ldbl-96/bits/iscanonical.h
@@ -24,6 +24,9 @@ extern int __iscanonicall (long double __x)
      __THROW __attribute__ ((__const__));
 #define __iscanonicalf(x) ((void) (__typeof (x)) (x), 1)
 #define __iscanonical(x) ((void) (__typeof (x)) (x), 1)
+#if __HAVE_DISTINCT_FLOAT128
+# define __iscanonicalf128(x) ((void) (__typeof (x)) (x), 1)
+#endif
 
 /* Return nonzero value if X is canonical.  In IEEE interchange binary
    formats, all values are canonical, but the argument must still be