diff --git a/include/boost/optional/detail/old_optional_implementation.hpp b/include/boost/optional/detail/old_optional_implementation.hpp
index 0128de4..2b7da28 100644
--- a/include/boost/optional/detail/old_optional_implementation.hpp
+++ b/include/boost/optional/detail/old_optional_implementation.hpp
@@ -542,7 +542,7 @@ class optional_base : public optional_tag
     //   Thus, the following overload is needed to properly handle the case when the 'lhs'
     //   is another optional.
     //
-    // For VC<=70 compilers this workaround dosen't work because the compiler issues and error
+    // For VC<=70 compilers this workaround doesn't work because the compiler issues and error
     // instead of choosing the wrong overload
     //
 #ifndef  BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
diff --git a/include/boost/optional/detail/optional_trivially_copyable_base.hpp b/include/boost/optional/detail/optional_trivially_copyable_base.hpp
index c1f8004..e8eff70 100644
--- a/include/boost/optional/detail/optional_trivially_copyable_base.hpp
+++ b/include/boost/optional/detail/optional_trivially_copyable_base.hpp
@@ -455,7 +455,7 @@ class tc_optional_base : public optional_tag
     //   Thus, the following overload is needed to properly handle the case when the 'lhs'
     //   is another optional.
     //
-    // For VC<=70 compilers this workaround dosen't work because the compiler issues and error
+    // For VC<=70 compilers this workaround doesn't work because the compiler issues and error
     // instead of choosing the wrong overload
     //
 #ifndef  BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES
diff --git a/include/boost/optional/optional.hpp b/include/boost/optional/optional.hpp
index d93f171..56d50d7 100644
--- a/include/boost/optional/optional.hpp
+++ b/include/boost/optional/optional.hpp
@@ -722,7 +722,7 @@ class optional_base : public optional_tag
     //   Thus, the following overload is needed to properly handle the case when the 'lhs'
     //   is another optional.
     //
-    // For VC<=70 compilers this workaround dosen't work because the compiler issues and error
+    // For VC<=70 compilers this workaround doesn't work because the compiler issues and error
     // instead of choosing the wrong overload
     //
 #ifndef  BOOST_OPTIONAL_DETAIL_NO_RVALUE_REFERENCES