diff --git a/usr.bin/dtc/checking.cc b/usr.bin/dtc/checking.cc
index ac417eb0613d..9c7f43c01dc5 100644
--- a/usr.bin/dtc/checking.cc
+++ b/usr.bin/dtc/checking.cc
@@ -195,6 +195,7 @@ check_manager::~check_manager()
 	while (disabled_checkers.begin() != disabled_checkers.end())
 	{
 		delete disabled_checkers.begin()->second;
+		disabled_checkers.erase(disabled_checkers.begin());
 	}
 }