diff --git a/source/iostreams.tex b/source/iostreams.tex
index d5d867ad11..cbaebfd5a4 100644
--- a/source/iostreams.tex
+++ b/source/iostreams.tex
@@ -9328,7 +9328,7 @@
     template<class T>
       void str(const T& t);
 
-   private:
+  private:
     basic_stringbuf<charT, traits, Allocator> @\exposid{sb}@;   // \expos
   };
 }