diff --git a/source/containers.tex b/source/containers.tex
index a61581bfdf..dc9719bf3b 100644
--- a/source/containers.tex
+++ b/source/containers.tex
@@ -16532,7 +16532,7 @@
   template<class T, class Container>
     constexpr bool operator!=(const stack<T, Container>& x, const stack<T, Container>& y);
   template<class T, class Container>
-   constexpr  bool operator< (const stack<T, Container>& x, const stack<T, Container>& y);
+    constexpr bool operator< (const stack<T, Container>& x, const stack<T, Container>& y);
   template<class T, class Container>
     constexpr bool operator> (const stack<T, Container>& x, const stack<T, Container>& y);
   template<class T, class Container>