diff --git a/winsup/cygwin/math/coshl.c b/winsup/cygwin/math/coshl.c
index d7eb4b7cb..e63699625 100644
--- a/winsup/cygwin/math/coshl.c
+++ b/winsup/cygwin/math/coshl.c
@@ -21,7 +21,7 @@ long double coshl(long double x)
   else if (x_class == FP_INFINITE)
     {
        errno = ERANGE;
-       return x;
+       return INFINITY;
     }
   x = fabsl (x);
   if (x > (MAXLOGL + LOGE2L))