diff --git a/source/expressions.tex b/source/expressions.tex
index 68629850bb..9ac47fb143 100644
--- a/source/expressions.tex
+++ b/source/expressions.tex
@@ -2438,7 +2438,7 @@
     @\commentellip@
   }
   template<class T> using fptr_t =
-     decltype(lambda_call_operator_invoker(declval<T>())) (*)(T);
+    decltype(lambda_call_operator_invoker(declval<T>())) (*)(T);
 
   template<class T> operator fptr_t<T>() const
     { return &lambda_call_operator_invoker; }