diff --git a/doc/closing_chapters/change_log.qbk b/doc/closing_chapters/change_log.qbk
index 91e9a765..80916a6a 100644
--- a/doc/closing_chapters/change_log.qbk
+++ b/doc/closing_chapters/change_log.qbk
@@ -31,6 +31,7 @@
 # [pull_request 121] fix compiler warning
 # [pull_request 122] Fix some fallthrough warnings with `gcc >= 7`
 # [pull_request 125] Prevent 2 unused parameter warnings
+# [pull_request 127] Silence 'unused variable' warning
 # [ticket 12092] Request: allow `std::tuple` typelists in `BOOST_AUTO_TEST_CASE_TEMPLATE`
 # [ticket 12597] Report tests with clashing names
 # [ticket 12969] Problem linking `print_helper_t<nullptr_t>` under Clang
diff --git a/include/boost/test/impl/debug.ipp b/include/boost/test/impl/debug.ipp
index f547052d..a5e5f6da 100644
--- a/include/boost/test/impl/debug.ipp
+++ b/include/boost/test/impl/debug.ipp
@@ -938,7 +938,7 @@ attach_debugger( bool break_or_continue )
     return true;
 
 #else // ****************************************************** default
-
+    (void) break_or_continue; // silence 'unused variable' warning
     return false;
 
 #endif