diff --git a/sim/configure b/sim/configure
index 7ed9834df39..be16fb4ac61 100755
--- a/sim/configure
+++ b/sim/configure
@@ -15824,7 +15824,7 @@ fi
 build_warnings="-Wall -Wpointer-arith
 -Wno-unused -Wunused-value -Wunused-function
 -Wno-switch -Wno-char-subscripts
--Wempty-body -Wunused-but-set-parameter
+-Wempty-body -Wunused-but-set-parameter -Wunused-but-set-variable
 -Wno-sign-compare -Wno-error=maybe-uninitialized
 -Wno-error=deprecated-register
 -Wmissing-declarations
diff --git a/sim/m4/sim_ac_option_warnings.m4 b/sim/m4/sim_ac_option_warnings.m4
index 52beee86c02..6e6add652fc 100644
--- a/sim/m4/sim_ac_option_warnings.m4
+++ b/sim/m4/sim_ac_option_warnings.m4
@@ -39,7 +39,7 @@ dnl NB: Kept somewhat in sync with gdbsupport/warnings.m4.
 build_warnings="-Wall -Wpointer-arith
 -Wno-unused -Wunused-value -Wunused-function
 -Wno-switch -Wno-char-subscripts
--Wempty-body -Wunused-but-set-parameter
+-Wempty-body -Wunused-but-set-parameter -Wunused-but-set-variable
 -Wno-sign-compare -Wno-error=maybe-uninitialized
 dnl C++ -Wno-mismatched-tags
 -Wno-error=deprecated-register