diff --git a/source/derived.tex b/source/derived.tex
index 3dc00f34ec..402d895757 100644
--- a/source/derived.tex
+++ b/source/derived.tex
@@ -800,7 +800,7 @@
 \pnum
 \indextext{definition!virtual~function}%
 A virtual function declared in a class shall be defined, or declared
-pure~(\ref{class.abstract}) in that class, or both; but no diagnostic is
+pure~(\ref{class.abstract}) in that class, or both; no diagnostic is
 required~(\ref{basic.def.odr}).
 \indextext{friend!\tcode{virtual}~and}%