diff --git a/src/code/irrat.lisp b/src/code/irrat.lisp
index 86c7d9ebe282897d31aebd66d502610645b39ebe..4ea134e7c3951e2910270af0a2cde578fff4608d 100644
--- a/src/code/irrat.lisp
+++ b/src/code/irrat.lisp
@@ -74,9 +74,9 @@
 (def-math-rtn ("__ieee754_sinh" %sinh) 1)
 (def-math-rtn ("__ieee754_cosh" %cosh) 1)
 (def-math-rtn ("fdlibm_tanh" %tanh) 1)
-(def-math-rtn "asinh" 1)
-(def-math-rtn "acosh" 1)
-(def-math-rtn "atanh" 1)
+(def-math-rtn ("fdlibm_asinh" %asinh) 1)
+(def-math-rtn ("__ieee754_acosh" %acosh) 1)
+(def-math-rtn ("__ieee754_atanh" %atanh) 1)
 
 ;;; Exponential and Logarithmic.
 (def-math-rtn ("__ieee754_exp" %exp) 1)