diff --git a/test/test_log.cpp b/test/test_log.cpp
index cee6ca8..e39c385 100644
--- a/test/test_log.cpp
+++ b/test/test_log.cpp
@@ -86,7 +86,7 @@ namespace
     {};
 }
 
-BOOST_AUTO_TEST_CASE( non_serializable_type_yields_an_question_mark_when_serialized )
+BOOST_AUTO_TEST_CASE( non_serializable_type_yields_a_question_mark_when_serialized )
 {
     BOOST_CHECK_EQUAL( "?", to_string( non_serializable() ) );
 }
@@ -155,7 +155,7 @@ namespace
     {};
 }
 
-BOOST_AUTO_TEST_CASE( type_derived_from_serializable_yields_an_question_mark_when_serialized )
+BOOST_AUTO_TEST_CASE( type_derived_from_serializable_yields_a_question_mark_when_serialized )
 {
 #ifdef MOCK_USE_CONVERSIONS
     BOOST_CHECK_EQUAL( "serializable", to_string( derived_from_serializable() ) );
@@ -170,7 +170,7 @@ namespace
     {};
 }
 
-BOOST_AUTO_TEST_CASE( type_derived_from_streamable_yields_an_question_mark_when_serialized )
+BOOST_AUTO_TEST_CASE( type_derived_from_streamable_yields_a_question_mark_when_serialized )
 {
 #ifdef MOCK_USE_CONVERSIONS
     BOOST_CHECK_EQUAL( "streamable", to_string( derived_from_streamable() ) );
@@ -189,7 +189,7 @@ namespace
     };
 }
 
-BOOST_AUTO_TEST_CASE( type_convertible_to_base_yields_an_question_mark_when_serialized )
+BOOST_AUTO_TEST_CASE( type_convertible_to_base_yields_a_question_mark_when_serialized )
 {
     BOOST_CHECK_EQUAL( "?", to_string( convertible_to_base() ) );
 }
@@ -202,7 +202,7 @@ namespace
     };
 }
 
-BOOST_AUTO_TEST_CASE( type_convertible_to_serializable_yields_an_question_mark_when_serialized )
+BOOST_AUTO_TEST_CASE( type_convertible_to_serializable_yields_a_question_mark_when_serialized )
 {
     BOOST_CHECK_EQUAL( "?", to_string( convertible_to_serializable() ) );
 }
@@ -215,7 +215,7 @@ namespace
     };
 }
 
-BOOST_AUTO_TEST_CASE( type_convertible_to_streamable_yields_an_question_mark_when_serialized )
+BOOST_AUTO_TEST_CASE( type_convertible_to_streamable_yields_a_question_mark_when_serialized )
 {
     BOOST_CHECK_EQUAL( "?", to_string( convertible_to_streamable() ) );
 }
@@ -232,7 +232,7 @@ namespace
     };
 }
 
-BOOST_AUTO_TEST_CASE( type_ambiguous_convertible_yields_an_question_mark_when_serialized )
+BOOST_AUTO_TEST_CASE( type_ambiguous_convertible_yields_a_question_mark_when_serialized )
 {
     BOOST_CHECK_EQUAL( "?", to_string( ambiguous_convertible() ) );
 }
@@ -529,7 +529,7 @@ namespace
     {}
 }
 
-BOOST_AUTO_TEST_CASE( callable_builtin_yields_an_question_mark_when_serialized )
+BOOST_AUTO_TEST_CASE( callable_builtin_yields_a_question_mark_when_serialized )
 {
     BOOST_CHECK_EQUAL( "?", to_string( callable_builtin ) );
     BOOST_CHECK_EQUAL( "?", to_string( &callable_builtin ) );