diff --git a/test.hpp b/test.hpp
index d286b8c..42870b9 100644
--- a/test.hpp
+++ b/test.hpp
@@ -44,7 +44,7 @@ namespace test // failure exception used to indicate checked test failures
         }
 
         // std::~string has no exception-specification (could throw anything),
-	// but we need to be compatible with std::~exception's empty one
+        // but we need to be compatible with std::~exception's empty one
         // see std::15.4p13 and std::15.4p3
         ~failure() throw()
         {