diff --git a/source/numerics.tex b/source/numerics.tex
index 88e1b149f8..bd86eee84d 100644
--- a/source/numerics.tex
+++ b/source/numerics.tex
@@ -9401,7 +9401,7 @@
 
 \indexlibrary{\idxcode{hypot}!3-argument form}%
 \begin{itemdecl}
-@\placeholder{floating-point-type}@ hypot(@\placeholder{floating-point-type}@ x, @\placeholder{floating-point-type}@ y, double z);
+@\placeholder{floating-point-type}@ hypot(@\placeholder{floating-point-type}@ x, @\placeholder{floating-point-type}@ y, @\placeholder{floating-point-type}@ z);
 \end{itemdecl}
 
 \begin{itemdescr}