diff --git a/lib/msun/src/e_scalb.c b/lib/msun/src/e_scalb.c
index cc35d172bf92..6553d50b2fb9 100644
--- a/lib/msun/src/e_scalb.c
+++ b/lib/msun/src/e_scalb.c
@@ -23,9 +23,6 @@ static char rcsid[] = "$FreeBSD$";
 #include "math.h"
 #include "math_private.h"
 
-/* XXX lost declaration of this and isinf() in math.h but still have funcs. */
-int	(isnan)(float x);
-
 #ifdef _SCALB_INT
 double
 __ieee754_scalb(double x, int fn)
diff --git a/lib/msun/src/e_scalbf.c b/lib/msun/src/e_scalbf.c
index f56e077eb429..e0e7c02753bc 100644
--- a/lib/msun/src/e_scalbf.c
+++ b/lib/msun/src/e_scalbf.c
@@ -20,9 +20,6 @@ static char rcsid[] = "$FreeBSD$";
 #include "math.h"
 #include "math_private.h"
 
-/* XXX lost declaration of this and isnan() in math.h but still have funcs. */
-int	(isnanf)(float x);
-
 #ifdef _SCALB_INT
 float
 __ieee754_scalbf(float x, int fn)