diff --git a/configure.ac b/configure.ac
index 3d7d8b29..e6ca29da 100644
--- a/configure.ac
+++ b/configure.ac
@@ -179,6 +179,7 @@ AC_CHECK_MATH_FUNC(gamma,[.5])
 AC_CHECK_MATH_FUNC(hypot, [.5,.5])
 AC_CHECK_MATH_FUNC(j0, [.5])
 AC_CHECK_MATH_FUNC(j1, [.5])
+AC_CHECK_MATH_FUNC(jn, [1,.5])
 AC_CHECK_MATH_FUNC(ldexp,[.5,2])
 AC_CHECK_MATH_FUNC(lgamma,[.5])
 AC_CHECK_MATH_FUNC(log10, [.5])
@@ -208,6 +209,7 @@ AC_CHECK_MATH_FUNC(tgamma, [.5])
 AC_CHECK_MATH_FUNC(trunc,[.5])
 AC_CHECK_MATH_FUNC(y0, [.5])
 AC_CHECK_MATH_FUNC(y1, [.5])
+AC_CHECK_MATH_FUNC(yn, [1,.5])
 
 dnl Thread local storage
 have___thread=no
diff --git a/src/libm.h b/src/libm.h
index fe2bb79e..b1db7882 100644
--- a/src/libm.h
+++ b/src/libm.h
@@ -144,10 +144,10 @@ LIBM_DD(y1)
 LIBM_DD_NO(y1)
 #endif
 #ifdef HAVE_JN
-LIBM_DID(jn)
+LIBM_DDD(jn)
 #endif
 #ifdef HAVE_YN
-LIBM_DID(yn)
+LIBM_DDD(yn)
 #endif
 #ifdef HAVE_CEIL
 LIBM_DD(ceil)